css 实现月牙形状好看的 选择框 checkbox

原理:
月牙形状其实就是圆形的box 加上box-shadow 来视觉上形成月牙状。刚好配合 input checkbox 的 checked属性 可以做一个css值切换。

html

 <label class="switch">
    <input type="checkbox" checked />
    <span class="slider"></span>
  </label>

css

   .switch {
  font-size: 17px;
  position: relative;
  display: inline-block;
  width: 3.5em;
  height: 1.5em;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color:#522ba7;
  transition: 0.5s;
  border-radius: 30px;
}
.slider:before {
  position: absolute;
  content: "";
  height: 1.1em;
  width: 1.1em;
  border-radius: 50%;
  left: 11%;
  bottom: 15%;
  box-shadow: inset 8px -4px 0px 0px #fff000;
  background: var(--background);
  transition: 0.5s;
}

input:checked + .slider {
  background-color:blue
}

input:checked + .slider:before {
  transform: translateX(150%);
  box-shadow: inset 15px -4px 0px 15px #fff000;
}