style.css

/* Normal tags */
body {
    background-color: #0d0d0d;
    font-family: 'Courier New', Courier, monospace;
}

h1 {
    color: rgb(243, 134, 134);
}

ul {
    list-style: none;
}

a {
    color: #0d0d0d;
}

footer {
    color: #0d0d0d;
    background-color: rgb(66, 66, 66);
    position: absolute;
    bottom: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 5px;
    font-size: 15px;
    font-family: 'Courier New', Courier, monospace;
}

/* BIG wrappers */
#wholeWrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#mainWrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 50px;
}

/* buttons */
button {
    width: 100px;
    height: 30px;
    border: 2px solid rgb(211, 211, 211);
    background-color: #0d0d0d;
    color: rgb(211, 211, 211);
    border-radius: 8px;
    font-family: 'Courier New', Courier, monospace;
}
button:hover {
    width: 100px;
    height: 30px;
    border: 2px solid rgb(211, 211, 211);
    background-color: rgb(211, 211, 211);
    color: #0d0d0d;
    border-radius: 8px;
    font-family: 'Courier New', Courier, monospace;
}

button.active {
    width: 100px;
    height: 30px;
    border: 2px solid rgb(211, 211, 211);
    background-color: rgb(211, 211, 211);
    color: #0d0d0d;
    border-radius: 8px;
    font-family: 'Courier New', Courier, monospace;
}

/* IDs */
#menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 50px;
}

#grid {
    background-color: rgb(211, 211, 211);
    display: grid;
    width: 500px;
    height: 500px;
    box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
}