在所有设备上正确缩放 div

Question

如何正确缩放 div 元素以适应特定区域？我有一个 div 元素，我想在悬停时缩放以适应中间的圆圈（参见代码 sn-p）。现在我可以设置缩放值，但这在更小或更大的屏幕上都无法正常工作。珊瑚色的 div 应该有 100vw。 以下是我的 HTML，css 和 jquery：

  $(".contact-button").hover(function(){
    $(".holdeer").addClass('contact');
    }, function(){
    
    $(".holdeer").removeClass('contact');
    });

.getintouch {
  border-top-left-radius: 0px;
  border-top-right-radius: 0px;
  border-bottom-left-radius: 0px;
  border-bottom-right-radius: 0px;
  height: 20vh;
  width: 100vw;
}







.contact-us {
  position: relative;
  z-index: 0;
  display: flex;
  height: 700px;
  width: 100vw;
  flex-direction: column;
  justify-content: space-around;
  align-items: stretch;
  background-color: transparent;
}
.contact-button {
  position: absolute;
  z-index: 100;
  display: flex;
  width: 200px;
  height: 200px;
  margin-top: 0px;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  align-self: center;
  flex-grow: 0;
  flex-shrink: 0;
  flex-basis: auto;
  border-top-style: solid;
  border-top-width: 1px;
  border-right-style: solid;
  border-right-width: 1px;
  border-bottom-style: solid;
  border-bottom-width: 1px;
  border-left-style: solid;
  border-left-width: 1px;
  border-top-left-radius: 50%;
  border-top-right-radius: 50%;
  border-bottom-left-radius: 50%;
  border-bottom-right-radius: 50%;
  background-color: transparent;
  color: blue;
  font-size: 32px;
  font-weight: 700;
}

.holdeer {
  position: absolute;
  left: 0%;
  top: 0%;
  right: 0%;
  bottom: 0%;
  display: block;
  width: auto;
  height: auto;
  justify-content: center;
  align-items: center;
  align-self: auto;
  flex-grow: 0;
  flex-shrink: 1;
  flex-basis: auto;
  background-color: coral;
}

.contact {
    
  animation: shrink  1s ease forwards;
  transition: all 1s;
    

}
@keyframes shrink {
   from {
   border-radius: 100%;
        }
        
    to{ 
    
    border-radius: 100%;
 transform: scale(0.15, 0.28);
}
  
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<section class="getintouch">
<div class="contact-us">
<div class = "contact-button"></div>
<div class="holdeer"></div>


</div>
 </section>

Answer 1

您可以使用更简单、更简洁的代码来做到这一点，也可以只使用 css。

.contact-us {
  overflow: hidden; /* to hide anything that goes outside */
  display: flex;
  height: 700px;
  width: 100vw;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: transparent;
}
.contact-button {
  position: relative; /* to make 'absolute' children relative to it */
  display: flex;
  width: 200px;
  height: 200px;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  border: 1px solid;
  border-radius: 50%;
  transition: all 1s;
}

.holdeer {
  position: absolute;
  z-index: -1;
  display: block;
  width: 100%; /* takes full width of parent */
  height: 100%; /* takes full height of parent */
  border-radius: 50%;
  transform: scale(15); /* scale to very large value to cover .contact-us and overflow: hidden with cut off what goes outside */
  transition: all 1s;
  background-color: coral;
  pointer-events: none; /* to disable hover on this child */
}
.contact-button:hover .holdeer {
  transform: scale(1); /* normal scale to fit the parent circle */
}

<div class="contact-us">
  <div class="contact-button"><div class="holdeer"></div></div>
</div>