使用绝对定位将 div 类居中答案

【问题标题】：Centering a div class in the middle using absolute positioning [duplicate]使用绝对定位将 div 类居中
【发布时间】：2021-07-21 17:08:52
【问题描述】：

我无法将这个 div 类放在中间。

它始终保持在顶部的中心，而不是中间。

我不知道怎么把它放在中间。

它的工作原理是，你点击播放图像，它就会打开。

宽度和高度相同的矩形，应该在中间。

https://jsfiddle.net/v3rn4tf0/

.wrap {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 25px;
  border: 3px solid red;
  box-sizing: border-box;
}

(function iife() {
  "use strict";

  function show(el) {
    el.classList.remove("hide");
     
  }

  function hide(el) {
    el.classList.add("hide");
  }

  function coverClickHandler(evt) {

    const curtain = document.querySelector(".curtain");
    curtain.classList.add("slide");
    const thewrap = curtain.parentElement.querySelector(".container");
    show(thewrap);
  }

    const cover = document.querySelectorAll('.jacketa');
    cover.forEach(function(el) {
      el.addEventListener('click', coverClickHandler)
    });
    }());

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background: #353198;
}

.curtain {
  position: relative;
  width: 100%;
  height: 100%;
}

.curtain.slide {
  height: auto;
  min-height: 100%;
  overflow: hidden;
}

.panel-left,
.panel-right {
  position: absolute;
  height: 100%;
  width: 50%;
  top: 0%;
  transition: all ease 10s;

  /*background-image: url("https://picsum.photos/600");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;*/
  overflow: hidden;
}

.panel-left {
  left: 0;
  /*background-color: rgb(91, 96, 106);*/
}

.panel-right {
  right: 0;
  /*background-color: rgb(229, 211, 211);*/
}

.panel-left::before,
.panel-right::before {
  content: "";
  position: absolute;
  height: 100%;
  width: 200%;
  top: 0;
  left: 0;
  background-image: url("https://picsum.photos/1920/1080");
  background-size: auto;
  background-repeat: no-repeat;
  background-position: 0 0;
}

.panel-right::before {
  left: -100%;
}

.curtain.slide .panel-left {
  transform: translateX(-100%);
}

.curtain.slide .panel-right {
  transform: translateX(100%);
}

.outer {
  display: table;
  height: 100%;
  margin: 0 auto;
}

.tcell {
  display: table-cell;
  vertical-align: middle;
}

.jacketa {
  position: absolute;
  top: 40px;
  width: 180px;
  height: 180px;
  cursor: pointer;
  border-radius: 50%;
  background: #130e85;
  border: 3px solid #f91f6e;
  box-sizing: border-box;
  box-shadow: 0 0 20px 2px #f9066bf7;
  display: block !important;
}

.j1 .jacketa {
  left: 30px;
}

.j2 .jacketa {
  right: 30px;
}

.jacketa .coversvg {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  margin: auto;
  cursor: pointer;
}

.jacketa .coversvg {
  width: 70px;
  height: 75.4px;
  fill: none;
  stroke-width: 4px;
  stroke-miterlimit: 10;
}

.jacketa .coversvg .back {
  stroke: #000;
  opacity: 0.15;
}

.jacketa .coversvg .front {
  stroke: #08f9ff;
  stroke-dasharray: 150;
  stroke-dashoffset: 1500;
  animation: draw 20s infinite linear, flicker-1 2s linear 2s infinite both;
}

@keyframes draw {
  100% {
    stroke-dashoffset: 0;
  }

  100% {
    stroke-dashoffset: 0;
  }
}

@keyframes flicker-1 {

  0%,
  100% {
    opacity: 1;
  }

  41.99% {
    opacity: 1;
  }

  42% {
    opacity: 0;
  }

  43% {
    opacity: 0;
  }

  43.01% {
    opacity: 1;
  }

  47.99% {
    opacity: 1;
  }

  48% {
    opacity: 0;
  }

  49% {
    opacity: 0;
  }

  49.01% {
    opacity: 1;
  }
}

.split-wrap {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 240px;
  height: 260px;
  margin: auto;
  border-radius: 50%;
  transition: 10s ease;
}

.j1 {
  position: absolute;
  left: 0;
  top: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
  transition: 10s ease;
}

.j2 {
  position: absolute;
  left: 50%;
  top: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
  transition: 10s ease;
}

.curtain.slide .j1 {
  left: -500%;
}

.curtain.slide .j2 {
  left: 500%;
}

.video-wrapper {
  min-width: 40%;
  max-width: 640px;
  margin: auto;
}

.ratio-keeper {
  position: relative;
  padding-top: 56.25%;
}

.video-frame {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.container {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  margin: auto;
  width: 100%;
  height: 100%;
}

.wrap {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 25px;
  border: 3px solid red;
  box-sizing: border-box;
}

.hide {
  display: none;
}

<div class="curtain">
  <div class="outer">
    <div class="tcell">

      <div class="container hide ">
        <div class="video-wrapper">
          <div class="ratio-keeper">

            <div class="wrap">
              <div class="video video-frame"></div>
            </div>
          </div>
        </div>
      </div>

      <div class="panel-left"> </div>
      <div class="panel-right"> </div>

      <div class="split-wrap">
        <div class="j1">
          <div class="jacketa" title="[ Enjoy The Music ]">
            <svg class="coversvg" width="70" height="75.4" viewBox="0 0 47.96 51.66">
              <title>[ Enjoy The Music ]</title>
              <path class="back" d="M2,25.83V4.11A2.11,2.11,0,0,1,5.13,2.27L44.88,24.45a2.11,2.11,0,0,1,0,3.7L5.1,49.41A2.11,2.11,0,0,1,2,47.55V25.83" />
              <path class="front" d="M2,25.83V4.11A2.11,2.11,0,0,1,5.13,2.27L44.88,24.45a2.11,2.11,0,0,1,0,3.7L5.1,49.41A2.11,2.11,0,0,1,2,47.55V25.83" />
            </svg>
          </div>
        </div>
        <div class="j2">
          <div class="jacketa" title="[ Enjoy The Music ]">
            <svg class="coversvg" width="70" height="75.4" viewBox="0 0 47.96 51.66">
              <title>[ Enjoy The Music ]</title>
              <path class="back" d="M2,25.83V4.11A2.11,2.11,0,0,1,5.13,2.27L44.88,24.45a2.11,2.11,0,0,1,0,3.7L5.1,49.41A2.11,2.11,0,0,1,2,47.55V25.83" />
              <path class="front" d="M2,25.83V4.11A2.11,2.11,0,0,1,5.13,2.27L44.88,24.45a2.11,2.11,0,0,1,0,3.7L5.1,49.41A2.11,2.11,0,0,1,2,47.55V25.83" />
            </svg>
          </div>


        </div>
      </div>

    </div>
  </div>
</div>

【问题讨论】：

标签： html css css-position

【解决方案1】：

你可以试试这个方法：

html,
body {
  height: 100%;
}

.centered-item {

  /* Positioning */
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  
  /* Styling */
  padding: 20px;
  font-family: "Open Sans", Arial, sans-serif;
  color: #FFFFFF;
  background: #1f2227;
  border-radius: 3px;
}

演示： https://jsfiddle.net/caneroncel/f5nuqkmv/1/

【讨论】：