html,
body {
    height: 100%;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: darkcyan;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
}

h1 {
    position: absolute;
    top: 80px;
    font-size: 1.8rem;
    text-transform: uppercase;
}

input {
    width: 2.8rem;
    text-align: center;
    font-size: 3rem;
    padding: 10px 2px;
    margin: 8px;
    border-radius: 5px;
    border: none;
    text-transform: uppercase;
}