按钮模版：btn-9

效果展示

实现思路

鼠标悬浮时，将背景颜色设为透明，将文字颜色设置成原来的背景颜色

将 :before 和 :after 两个伪元素的宽度变长，配合上 ransition 实现动画效果

实现代码

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<button class="btn-9">BTN-9</button>
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.btn-9 {
  position: relative;
  padding: 16px 28px;
  border: none;
  color: #fff;
  background: linear-gradient(0deg, rgba(255, 27, 0, 1) 0%, rgba(251, 75, 2, 1) 100%);
  cursor: pointer;
}
.btn-9:hover {
  color: #f0094a;
  background: transparent;
  box-shadow: none;
}
.btn-9:before,
.btn-9:after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  height: 2px;
  width: 0;
  background: #f0094a;
  box-shadow:
    -1px -1px 5px 0px #fff,
    7px 7px 20px 0px #0003,
    4px 4px 5px 0px #0002;
  transition: all .3s ease;
}
.btn-9:after {
  right: inherit;
  top: inherit;
  left: 0;
  bottom: 0;
}
.btn-9:hover:before,
.btn-9:hover:after {
  width: 100%;
  transition: all .4s ease;
}