html,
body{
    font-size: 20px;
    color: white;
    /* add font */

    width: 100%;
    height: 100%;

    margin: 0px;
    padding: 0px;

    background-color: black;

    text-align: center;
}

h1{
    margin-bottom: 25px;
    text-decoration: underline;
}

input{
    height: 25px;
    border-radius: 15px;
    padding: 0px 5px;
}

button{
    height: 25px;
    border-radius: 5px;
}