* {
  margin: 0;
  padding: 0;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  flex-direction: column;
  background: #19011d;
}
.buttonClass {
  position: relative;
  padding: 15px 30px;
  margin: 10px;
  background: #27022d;
  color: #fff;
  text-decoration: none;
  letter-spacing: 1px;
  border: 1px solid #000;
  transition: 0.5s;
  overflow: hidden;
}
.buttonClass:hover {
  background: #3213be;
}
/* 设置第二个按钮的颜色 */
.buttonClass:nth-child(2):hover {
  background: #d1b723;
}

.buttonClass::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, #fff, transparent);
  transition: 0.5s;
}
.buttonClass:hover::before {
  left: 100%;
}