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

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    height: 100vh;
}

.box {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(0.5em, 5vw, 2em);
    color: white;
    padding: 1em;
    text-align: center;
    transition: transform 0.3s ease;
    z-index: 1;
    cursor: pointer;
    position: relative;
}

.fullscreen {
    position: fixed !important;
    top: 0;
    left: 0;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 999;
    display: flex;
    transition: all 0.5s ease;
}