纯css实现左右拖拽改变盒子大小

效果：
在这里插入图片描述

代码

<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html;charset=utf-8"><title></title><style>body {background-color: black;color: white;}.column {overflow: hidden;}.column-left {height: 97VH;background-color: #111;position: relative;float: left;}.column-right {height: 97VH;padding: 16px;background-color: #111;box-sizing: border-box;overflow: hidden;}.resize-save {position: absolute;top: 0;right: 5px;bottom: 0;left: 0;padding: 16px;overflow-x: hidden;}.resize-bar {width: 200px;height: inherit;resize: horizontal;cursor: ew-resize;cursor: col-resize;opacity: 0;overflow: scroll;}/* 拖拽线 */.resize-line {position: absolute;right: 0;top: 0;bottom: 0;border-right: 2px solid #111;border-left: 1px solid #bbb;pointer-events: none;}.resize-bar:hover~.resize-line,.resize-bar:active~.resize-line {border-left: 1px dashed skyblue;}.resize-bar::-webkit-scrollbar {width: 100px;height: inherit;cursor: ew-resize;cursor: col-resize;}/* Firefox只有下面一小块区域可以拉伸 */@supports (-moz-user-select: none) {.resize-bar:hover~.resize-line,.resize-bar:active~.resize-line {border-left: 1px solid #bbb;}.resize-bar:hover~.resize-line::after,.resize-bar:active~.resize-line::after {content: '';position: absolute;width: 16px;height: 16px;bottom: 0;right: -8px;background: url(./resize.svg);background-size: 100% 100%;}}/*mobile*/@media screen and (max-width: 640px) {.main {-webkit-user-select: none;user-select: none;}}</style>
</head><body><div class="column"><div class="column-left"><div class="resize-bar"></div><div class="resize-line"></div><div class="resize-save">左侧的内容，左侧的内容，左侧的内容，左侧的内容</div></div><div class="column-right">右侧的内容，右侧的内容，右侧的内容，右侧的内容</div></div>
</body></html>