源码
<div class="wrap">
<div class="section">
<input type="checkbox" id="c" hidden>
<div class="content">
<pre class="text">
.content{
width: 100%;
max-height: 200px;
overflow: hidden;
outline: 2px dashed #ddd;
-webkit-mask: linear-gradient(red 150px, transparent 200px);
}
.content label{
float: right;
width: 100px;
text-align: center;
position: relative;
left: calc(50% - 50px);
transform: translateY(-100%);
cursor: pointer;
}</pre>
<label for="c"></label>
</div>
</div>
</div>
<style>
.section {
display: flex;
}
.section .content {
width: 100%;
max-height: 200px;
overflow: hidden;
border-radius: 8px;
outline: 2px dashed #ddd;
}
.section .content::before {
content: "";
width: 100px;
height: 100%;
float: left;
}
.section pre {
white-space: pre-wrap;
box-sizing: border-box;
width: 100%;
padding: 10px;
float: right;
line-height: 1.5;
margin: 0;
margin-left: -100px;
font-size: 18px;
color: #232323;
-webkit-mask: linear-gradient(red 150px, transparent 200px);
}
.section label {
float: right;
width: 100px;
text-align: center;
position: relative;
left: calc(50% - 50px);
transform: translateY(-100%);
cursor: pointer;
}
.section label::after {
content: "";
display: block;
height: 30px;
background-color: #666;
transition: 0.2s background-color;
-webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 320 512'%3E %3Cpath d='M143 352.3L7 216.3c-9.4-9.4-9.4-24.6 0-33.9l22.6-22.6c9.4-9.4 24.6-9.4 33.9 0l96.4 96.4 96.4-96.4c9.4-9.4 24.6-9.4 33.9 0l22.6 22.6c9.4 9.4 9.4 24.6 0 33.9l-136 136c-9.2 9.4-24.4 9.4-33.8 0z'%3E%3C/path%3E %3C/svg%3E") center/ 24px 24px no-repeat;
}
.section label:hover::after {
background-color: royalblue;
}
.section label::before {
content: "";
position: absolute;
left: 0;
right: 0;
bottom: 0;
height: 30px;
}
.section input:checked+.content {
max-height: fit-content;
}
.section input:checked+.content label {
left: auto;
right: calc(50% - 50px);
}
.section input:checked+.content label::after {
transform: scaleY(-1);
}
.section input:checked+.content .text {
-webkit-mask: none;
}
</style>
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