【问题标题】:Square div with border. Only show the corners [duplicate]带边框的方形 div。只显示角落[重复]
【发布时间】:2017-06-10 14:56:24
【问题描述】:

我有一个播放器,可以在我的网站上使用。
我想改变播放按钮的外观。

我想用虚线边框来做这件事,然后增加虚线之间的空间。那没用。

我无法使用图片。有CSS(3) 解决方案吗?

我希望它看起来像这样。

这真的都是关于角落的!

------------- 更新-----

所以我使用@Naila 的解决方案使其工作。 针对以下问题运行:

我将Video.jsplugin 用于WordPress,我正在创建一个新皮肤

当我关注css 时,我发现已经有一个::before-pseudo 来处理播放箭头。

箭头的::before-pseudo 表示宽度为 100%,这有助于箭头位于中心。 因为我使用 30% 的宽度使边框成为一个角。这会覆盖 100% 的早期宽度。结果如下:

这里是:
CodePen

如果您只是在 CSS 字段中通过此 CSS,您将得到我现在所在的位置并看到问题:

/*
Player Skin Designer for Video.js
http://videojs.com

To customize the player skin edit 
the CSS below. Click "details" 
below to add comments or questions.
This file uses some SCSS. Learn more  
at http://sass-lang.com/guide)

This designer can be linked to at:
http://codepen.io/heff/pen/EarCt/left/?editors=010
*/

// The following are SCSS variables to automate some of the values.
// But don't feel limited by them. Change/replace whatever you want. 

// The color of icons, text, and the big play button border.
// Try changing to #0f0
$primary-foreground-color: #fff; // #fff default
// The default color of control backgrounds is mostly black but with a little
// bit of blue so it can still be seen on all-black video frames, which are c ommon.
// Try changing to #900
$primary-background-color: #2B333F;  // #2B333F default

// Try changing to true
$center-big-play-button: true; // true default

.video-js {
 /* The base font size controls the size of everything, not just text.
 All dimensions use em-based sizes so that the scale along with the font size.
 Try increasing it to 15px and see what happens. */
 font-size: 10px;

 /* The main font color changes the ICON COLORS as well as the text */
 color: $primary-foreground-color;
}

/* The "Big Play Button" is the play button that shows before the video plays.
To center it set the align values to center and middle. The typical location
of the button is the center, but there is trend towards moving it to a corner
where it gets out of the way of valuable content in the poster image.*/
.vjs-default-skin .vjs-big-play-button {
  /* The font size is what makes the big play button...big. 
 All width/height values use ems, which are a multiple of the font size.
 If the .video-js font-size is 10px, then 3em equals 30px.*/
 font-size: 3em;

 /* We're using SCSS vars here because the values are used in multiple places.
 Now that font size is set, the following em values will be a multiple of the
 new font size. If the font-size is 3em (30px), then setting any of
 the following values to 3em would equal 30px. 3 * font-size. */
 $big-play-width: 3em; 
  /* 1.5em = 45px default */
  $big-play-height: 3em;

 line-height: $big-play-height;
 height: $big-play-height;
 width: $big-play-width;

 /* 0.06666em = 2px default */
 /* 0.3em = 9px default */
 border:none;
 border-radius:0;

 @if $center-big-play-button {
 /* Align center */
left: 50%;
top: 50%;
margin-left: -($big-play-width / 2);
margin-top: -($big-play-height / 2);   
} @else {
/* Align top left. 0.5em = 15px default */
left: 0.5em;
top: 0.5em;
}
}
.vjs-big-play-button:before {
 position: absolute;
content: "";
width: 30px !important;
height: 30px!important;
right: -2px;
bottom: -2px;
 border-left: 2px solid $primary-foreground-color;
border-top: 2px solid $primary-foreground-color;
}
.vjs-big-play-button:after {
 position: absolute;
 content: "";
 width: 30px;
 height: 30px;
 right: -2px;
 bottom: -2px;
 border-right: 2px solid $primary-foreground-color;
 border-bottom: 2px solid $primary-foreground-color;
}

/* The default color of control backgrounds is mostly black but with a little
  bit of blue so it can still be seen on all-black video frames, which are     common. */
.video-js .vjs-control-bar,
.video-js .vjs-big-play-button,
.video-js .vjs-menu-button .vjs-menu-content {
  /* IE8 - has no alpha support */
  background-color: $primary-background-color;
  /* Opacity: 1.0 = 100%, 0.0 = 0% */
  background-color: rgba($primary-background-color, 0.7);
}

// Make a slightly lighter version of the main background
// for the slider background.
$slider-bg-color: lighten($primary-background-color, 33%);

/* Slider - used for Volume bar and Progress bar */
.video-js .vjs-slider {
 background-color: $slider-bg-color;
 background-color: rgba($slider-bg-color, 0.5);
}

/* The slider bar color is used for the progress bar and the volume bar
(the first two can be removed after a fix that's coming) */
.video-js .vjs-volume-level,
.video-js .vjs-play-progress,
.video-js .vjs-slider-bar {
background: $primary-foreground-color;
}

/* The main progress bar also has a bar that shows how much has been loaded.     */
.video-js .vjs-load-progress {
  /* For IE8 we'll lighten the color */
  background: lighten($slider-bg-color, 25%);
  /* Otherwise we'll rely on stacked opacities */
  background: rgba($slider-bg-color, 0.5);
}

/* The load progress bar also has internal divs that represent
 smaller disconnected loaded time ranges */
.video-js .vjs-load-progress div {
  /* For IE8 we'll lighten the color */
  background: lighten($slider-bg-color, 50%);
  /* Otherwise we'll rely on stacked opacities */
  background: rgba($slider-bg-color, 0.75);
}

【问题讨论】:

  • 是的,有办法,到目前为止你有什么尝试?
  • 似乎内联 svg 比纯 css 更干净
  • @DominicTobias 纯 css3 做到了 :)
  • @GCyrillus 很有趣,我只能想象带有伪元素的东西

标签: html css css-shapes


【解决方案1】:

我们可以使用 pseudo 元素来做到这一点,查看演示

.box {
  width: 200px;
  height: 200px;
  margin: 15px auto;
  background: #999;
  position: relative;
}
.box:before {
  position: absolute;
  content: "";
  width: 30px;
  height: 30px;
  top: -2px;
  left: -2px;
  z-index:-1;
  border-left: 2px solid red;
  border-top: 2px solid red;
}
.box:after {
  position: absolute;
  content: "";
  width: 30px;
  height: 30px;
  right: -2px;
  bottom: -2px;
  z-index:-1;
  border-right: 2px solid red;
  border-bottom: 2px solid red;
}
<div class="box"></div>

【讨论】:

  • 看起来线条应该与框重叠 fyi
  • @DominicTobias 请立即查看
  • 这很好。谢谢。我去看看!
【解决方案2】:

您可以使用一个元素并使用伪元素创建边框,而对于箭头,您可以使用特殊字符。您也可以使用Flexbox 进行对齐。

body {
  background: #000000;
}
.button {
  margin: 50px;
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1E232C;
  color: white;
  font-size: 20px;
  position: relative;
}
.button:before,
.button:after {
  width: 30px;
  height: 30px;
  content: '';
  position: absolute;
}
.button:before {
  border-top: 1px solid white;
  border-left: 1px solid white;
  top: 0;
  left: 0;
}
.button:after {
  border-right: 1px solid white;
  border-bottom: 1px solid white;
  bottom: 0;
  right: 0;
}
<div class="button">►</div>

【讨论】:

    【解决方案3】:

    为什么不用box-shadow 代替角落的伪元素?

    html,body{
      background: black;
      height: 100%;
    }
    .player{
      background: #333;
      box-shadow: 16px 16px 0 -15px white, -16px -16px 0 -15px white;
      display: block;
      height: 50px;
      margin: 50px auto;
      position: relative;
      width: 50px;
    }
    .player::before{
      border-color: transparent transparent transparent white;
      border-style: solid;
      border-width: 10px;
      content: "";
      display: block;
      left: 20px;
      position: absolute;
      top: 15px;
    }
    <span class="player"></span>

    【讨论】:

      【解决方案4】:

      既然回答了,这里有一些方法(包括悬停效果和半径测试)没有伪和 CSS(3)

      (使用我一天前评论的阴影和渐变)

      SVG 不涉及,也不是必需的,但也可以完成这项工作。

      div:nth-child(1),div:nth-child(6),div:nth-child(11) {
        box-shadow: 
          -70px -70px 0 -67px red, 
           70px  70px 0 -67px red;
      }
      div:nth-child(1):hover,div:nth-child(6):hover,div:nth-child(11):hover {
        box-shadow: 
          -70px -70px 0 -67px red, 
           70px  70px 0 -67px red, 
            0     0   0  3px gold;
      }
      
      div:nth-child(2),div:nth-child(7),div:nth-child(12) {
        background: 
          linear-gradient(#333, #333) no-repeat center, 
          linear-gradient(to bottom right, red 20%, transparent 20%, transparent 80%, red 80%) no-repeat center ;
        background-size: 
          auto auto, 
          200px 200px;
      }
      div:nth-child(2):hover, div:nth-child(7):hover,div:nth-child(12):hover {
        background: 
          linear-gradient(#333, #333) no-repeat center, 
          linear-gradient(to bottom right, red 20%, transparent 20%, transparent 80%, red 80%) no-repeat center,
          white;
        background-size: 
          auto auto, 
          200px 200px;
      }
      div:nth-child(3),div:nth-child(8),div:nth-child(13) {
        border:none;
        padding:3px;
        background:
          linear-gradient(red,red) no-repeat top left,
          linear-gradient(red,red) no-repeat top left,
          linear-gradient(red,red) no-repeat bottom right,
          linear-gradient(red,red) no-repeat bottom right,
          linear-gradient(#333,#333) center no-repeat ;
        background-size: 
          40% 3px, 
          3px 40%,
          40% 3px, 
          3px 40%, 
          auto auto;
        background-clip:
          border-box,
          border-box,
          border-box,
          border-box,
          content-box;
          
      }
      div:nth-child(3):hover, div:nth-child(8):hover,div:nth-child(13):hover {
        border:none;
        padding:3px;
        background:
          linear-gradient(red,red) no-repeat top left,
          linear-gradient(red,red) no-repeat top left,
          linear-gradient(red,red) no-repeat bottom right,
          linear-gradient(red,red) no-repeat bottom right,
          linear-gradient(#333,#333) center no-repeat, 
          green ;
        background-size: 
          40% 3px, 
          3px 40%,
          40% 3px, 
          3px 40%, 
          auto auto;
        background-clip:
          border-box,
          border-box,
          border-box,
          border-box,
          content-box;
          
      }
      
      div {
        width: 200px;
        height:200px;
        margin: 10px;
        background: #333;
        border: solid transparent;
        box-sizing: border-box;
        display:inline-flex;
        vertical-align:middle;
        flex-direction:column;
        align-items:center;
        justify-content:center;
        text-align:center;
        color:white;
      }
      hr~div {
        border-radius:5px;
      }
      hr~hr~div {
        border-radius:25px;
      }
      html {
        background:gray;
        text-align:center
      }
      <div>red broken borders drawn via <code>shadow</code>
      </div>
      <div>red broken borders drawn via <code>linear&shy;-gradient</code> 
      </div>
      <div>red broken borders drawn via multiple <code>linear&shy;-gradient</code> & <code>background&shy;-clip, background&shy;-size, background&shy;-position</code> 
      </div>
      <hr/>
      <p>Can a small <code>border-radius</code> be applied ?</p>
      <div>red broken borders drawn via <code>shadow</code>
      </div>
      <div>red broken borders drawn via <code>linear&shy;-gradient</code> 
      </div>
      <div>red broken borders drawn via multiple <code>linear&shy;-gradient</code> & <code>background&shy;-clip, background&shy;-size, background&shy;-position</code> 
      </div>
      <hr/>
      <p>Can a big <code>border-radius</code> be applied ?</p>
      <div>red broken borders drawn via <code>shadow</code>
      </div>
      <div>red broken borders drawn via <code>linear&shy;-gradient</code> 
      </div>
      <div>red broken borders drawn via multiple <code>linear&shy;-gradient</code> & <code>background&shy;-clip, background&shy;-size, background&shy;-position</code> 
      </div>

      如果您确实需要修复更大的半径,请在第三个示例中重新排列 bg-gradient 和 background-size。请参阅codepen 中的第 10 个 div 来玩 ;)

      【讨论】:

        【解决方案5】:

        我会这样写这个按钮,请根据你的设计重写你的单位:

            .play-icon {position:relative;}
            .play-icon:before {content: '';position:absolute;left:-1px;top:-1px; 
        width:10px; height:10px; border-left:1px solid #fff; border-top:1px solid #fff; 
        display:inline-block; }
            .play-icon:after {content: '';position:absolute;right:-1px;bottom:-1px; 
        width:10px; height:10px; border-right:1px solid #fff; 
        border-bottom:1px solid #fff; display:inline-block; }
        

        【讨论】:

          【解决方案6】:

          如果伪元素不是你的包:

          body { background: #555; }
          
          .parent, .main { position: relative; height: 100px; width: 100px; }
          .main { background-color: navy; z-index: 2; }
          .sub { position: absolute; background-color: white; height: 30px; width: 30px; z-index: 1; }
          .sub.tl { top:-1px; left:-1px; }
          .sub.br { bottom:-1px; right:-1px; }
          <div class="parent">
            <div class="main"></div>
            <div class="sub tl"></div>
            <div class="sub br"></div>
          </div>

          【讨论】:

            【解决方案7】:

            这可以通过 CSS pseudo elements. 的使用来实现,您只需要创建两个白框并将它们放在其父级下方,仅在伪元素上使用负 z-index,因为如果您设置父级的 z-index,伪元素将不知道如何处理它们的 z-index,因为父级的 z-index 具有更大的权重。

            这是一个有效的Fiddle.

            <div class="container">
              <div class="play-box"></div>
            </div>
            

            body {
              background: black;
            }
            
            .play-box {
              margin: 5rem;
              width: 200px;
              height: 200px;
              background: #2f2f2f;
              position: relative;
            }
            
            .play-box::before,
            .play-box::after {
              position: absolute;
              content: '';
              background: #fff;
              width: 50px;
              height: 50px;
              z-index: -1;
            }
            
            .play-box::before {
              left: -1px;
              top: -1px;
            }
            
            .play-box::after {
              right: -1px;
              bottom: -1px;
            }
            

            【讨论】:

              【解决方案8】:

              使用:before:after 的组合可以获得您想要的效果。

              这个想法是使用:before:after 伪元素在你的元素中创建2个较小的正方形,并分别在它们的顶部/左侧和底部/右侧赋予它们白色边框。

              由于您的设计要求白色边框在按钮外部偏移,我们将使用负定位。

              html,
              body {
                height: 100%;
                width: 100%;
                background-color: #000000;
              }
              
              .container {
                height: 100%;
                display: flex;
                justify-content: center;
                align-items: center;
              }
              
              .btnPlay {
                position: relative;
                color: #ffffff;
                font-size: 20px;
                width: 100px;
                height: 100px;
                line-height: 100px;
                text-align: center;
                background-color: #222222;
                transition: background 0.1s ease-out;
              }
              
              .btnPlay:before,
              .btnPlay:after {
                content: "";
                position: absolute;
                display: block;
                width: 25px;
                height: 25px;
              }
              
              .btnPlay:before {
                top: -1px;
                left: -1px;
                border-left: 1px solid #ffffff;
                border-top: 1px solid #ffffff;
              }
              
              .btnPlay:after {
                bottom: -1px;
                right: -1px;
                border-right: 1px solid #ffffff;
                border-bottom: 1px solid #ffffff;
              }
              
              .btnPlay:hover {
                cursor: pointer;
                background-color: #292929;
              }
              <div class="container">
                <div class="btnPlay">
                  &#9658;
                </div>
              </div>

              【讨论】:

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