index.css

a {
  color: #b854d4;
  text-decoration: none;
  position: relative;
}
a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1.5px;
  word-wrap: break-word;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: bottom right;
  transition: transform .3s ease-out;
}
a:hover::after {
  transform-origin: bottom left;
  transform: scaleX(1);
}

html, body {
  width: 100%;
  height: 100%;
  min-height: 100%;
  overflow: hidden;
}

.bg, .bg::after, .bg-image {
  background-color: #ffffffa6;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.bg {
  z-index: -1;
}
.bg:after {
  content: "";
  z-index: 1;
}
.bg-image {
  z-index: -1;
  background-image: url(./bg.png);
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
}

@media screen and (min-width: 400px) {
  .layout {
    max-width: 600px;
    max-height: 400px;
  }

}

.layout {
  
  padding-top: 40px;
  padding-bottom: 40px;
  position: fixed;
  left: 50%;
  top: 50%;
  width: 100%;
  height: 50%;
  transform: translate(-50%, -50%);
  border-radius: 8px;
  background-color: #ffffffa6;
  box-shadow: 0 14px 38px #00000014, 0 3px 8px #0000000f;
  user-select: none;
  overflow: hidden;
}
.layout::before {
  content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 150px;
    height: 100%;
    transform: skew(-30deg);
    transition: left 1s ease 0s;
    z-index: 1;
    background: linear-gradient(to right,rgba(255,255,255,0) 0,rgba(255,255,255,.5) 50%,rgba(255,255,255,0) 100%);
}
.layout:hover::before {
  left: 150%;
}
.home {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  display:none;
}

.home.show, .contact.show {
  display: flex;
}

.contact {
  width: 100%;
  height: 100%;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position:relative;
  display: none;
}

.vx-img.show, .qqgroup-img.show {
  display: block;
  z-index: 1;
  opacity: 1;
}

.vx-img, .qqgroup-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0;
  
  transition: all 1s ease;
}
.vx-img img, .qqgroup-img img {
  width: 200px;
  height: 200px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}