html {
    font-size: 62.5%;
    font-size: 16px;
    font-size: 1.6rem;
}

h1 {
    font-size: 30px;
    font-size: 3.0rem;
}

p, a, button{
    font-size: 16px;
    font-size: 1.6rem;
}

button {
    margin: 10px 0;
}

a,button {
    display: block;
    padding: 10px 0;
    border: 2px solid black;
    border-radius: 10px;
    text-align: center;
    background-color: darkCyan;
    color: white;
    text-decoration: none;
    width: 100%;
    cursor: pointer;
}

a:hover, button:hover {
    text-decoration: underline;
    background-color: #00AAAAAA;
;
}