style.css

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    background-color: #313131;
}

header {
    display: flex;
    flex-direction: column;
    background-color: #1d1d1d;
    margin: 0;
    color: #d1d1d1;
    align-items: center;
}

h1 {
    margin: 0;
}

footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    background-color: #1d1d1d;
    margin: 0;
    color: #d1d1d1;
    align-items: center;
}

#cube {
    background-color: gray;
    width: 25vh;
    height: 25vh;
    margin: 6vh 3vw;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 6vh 6vw;
}

.line {
    margin-top: 3vh;
}

button {
    margin-top: 3vh;
    padding: 0.5rem 1rem;
    background-color: #1d1d1d;
    color: #d1d1d1;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #313131;
}

input{
    background-color: #313131;
    border: none;
    border-bottom: 2px solid #1d1d1d;
    color: #d1d1d1;
    outline: none;
    font-weight: 900;
}