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(.5);
    letter-spacing: 4px;
}

.btn{
    background: black;
    color: white;
    padding: 20px 40px;
    font-size: 25px;
    border: 4px solid;
    cursor: pointer;
    transition: 1s background-color, 1s color;
    white-space: nowrap;
}

.btn:hover{
    background: white;
    color: black;
}

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

.split.left{
    position: absolute;
    left: 0;
    background: pink;
    background-image: url("https://www.smartmobil.de/handyshop/image/1619741?t=1726136708");
    background-size: cover;
    overflow: hidden;
    transition: .5s width;
}

.split.right{
    position: absolute;
    right: 0;
    background: lightblue;
    background-image: url("https://cdn.idealo.com/folder/Product/205569/4/205569450/s1_produktbild_max/samsung-galaxy-s25.jpg");
    background-size: cover;
    overflow: hidden;
    transition: .5s width;
}

.active-left .left{
    width: 70%;
}

.active-left .right{
    width: 30%
}

.active-right .left{
    width: 30%;
}

.active-right .right{
    width: 70%
}