图标悬停圆形背景效果

把鼠标移到下面的 T 恤图标上，就会出现类似“铃铛”示例的浅灰圆形背景。

CSS 核心代码（可复制）

.icon-hover-btn {
  position: relative;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: #333;
  cursor: pointer;
  transition: color 0.2s ease;
}
.icon-hover-btn::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: #f2f3f5;
  transform: scale(0.6);
  opacity: 0;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1),
              opacity 0.2s ease;
}
.icon-hover-btn:hover::before,
.icon-hover-btn:focus-visible::before {
  transform: scale(1);
  opacity: 1;
}
.icon-hover-btn svg {
  position: relative;
  z-index: 1;
  width: 22px;
  height: 22px;
}

Element Plus 用法示例

<el-button class="icon-hover-btn" link>
  <el-icon size="22"><Upload /></el-icon>
</el-button>