body {
  margin: 0;
  display: flex;
  justify-content: center;
  height: 100vh;
  align-items: center;
  text-align: center;
  font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
}

h1 {
  font-size: 100px;
  color: aliceblue;
  backdrop-filter: brightness(0.5);
  letter-spacing: 4px;
}

.btn {
  background-color: #4caf50;
  color: white;
  padding: 20px 40px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 20px;
  margin: 20px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  transition: 1s background-color;
  white-space: nowrap;
}

.btn:hover {
  background-color: #45a049;
  color: black;
}

.split {
  width: 50%;
  height: 100%;
  /* top: 0; */
}

.split.left {
  position: absolute;
  left: 0;
  top: 0;
  background-color: pink;
  background-image: url("https://img.xfinitymobile.com/image/fetch/e_trim/w_420,h_420,c_fit,f_auto,q_auto,fl_lossy/https%3A%2F%2Fimg.xfinitymobile.com%2Fimage%2Fupload%2Fv1694556635%2Fclient%2Fcatalog%2Fdevices%2Fapple%2FApple_iPhone-15-Pro-Max_Blue-Titanium_PRI.png");
  background-size: 65%;
  background-repeat: no-repeat; /* 确保背景图片不会重复 */
  background-position: center; /* 居中背景图片 */
}

.split.right {
  position: absolute;
  right: 0;
  top: 0;
  background-color: lightblue;
  background-image: url("https://fscl01.fonpit.de/devices/98/2998.png");
  background-size: 90%;
  background-repeat: no-repeat; /* 确保背景图片不会重复 */
  background-position: center; /* 居中背景图片 */
}

.active-left .left {
  width: 75%;
}

.active-left .right {
  width: 25%;
}

.active-right .left {
  width: 25%;
}

.active-right .right {
  width: 75%;
}

.left,
.right {
  transition: width 2s ease-in-out;
}