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

h1 {
    font-size: 6.25em;
    color: aliceblue;
    backdrop-filter: brightness(0.5);
    letter-spacing: 4px;
}

.split {
    width: 50%;
    height: 100%;
    overflow: hidden;
}

.split.left {
    position: absolute;
    left: 0;
    top: 0;
    background-color: pink;
    background-image: url("https://phones.mintmobile.com/wp-content/uploads/2023/09/Apple_iPhone_15_Pro_Max_Blue_Titanium_PDP_Image.png");
    background-size: cover;
}

.split.right {
    position: absolute;
    right: 0;
    top: 0;
    background-color: lightblue;
    background-image: url("https://www.att.com/scmsassets/global/devices/phones/samsung/samsung-galaxy-s24/carousel/onyx-black-1.png");
    background-size: cover;
}

.btn {
    background-color: black;
    color: white;
    padding: 1.25em 2.5em;
    font-size: 1.5625em;
    border: 0.25em solid;
    cursor: pointer;
    transition: 1s background-color ease;
    white-space: nowrap;
}

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

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

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

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

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

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