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

body {
    color: white;
    background-color: #0B111B;
    text-align: center;
    height: 100vh;
    user-select: none;
    font-family:sans-serif;
    overflow: none;
}

.periodic_table {
    height: fit-content;
    position: relative;
    display: grid;
    grid-template-columns: repeat(18, minmax(0, 1fr));
    gap: 10px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 20px;
    width: 90%;
    font-weight: 700;
}

.periodic_table div {
    width: 60px;
    height: 60px;
    display: flex;
    text-align: center;
    justify-content: center;
    align-items: center;
    border-radius: 25px;
    border: 1px solid #26394f;
    transition: 0.2s;
    background-color: #111C2B;
}

.periodic_table div:hover {
    transform: translateY(-5px) scale(1.1);
    border: 1px solid #67E8F9;
}

/* .periodic_table div:nth-child(2) {
    grid-row: 2;
    grid-column: 10;
} */

h1 {
    position: absolute;
    top: 50px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 42px;
    text-transform: uppercase;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    letter-spacing: 2px;
}