style.css

@import 'https://fonts.googleapis.com/css?family=Open+Sans|Raleway:700';

html{
    background: rgb(245,253,255);
    text-align: center;
    font-family: "Open Sans", sans-serif;
    margin-top: calc(8em)
}

h1{
    font-family: "Raleway", sans-serif;
    font-size: 3em;
}

p{
    padding: 5px 10%;
}

button{
    border: 1px solid lightgray;
    background: rgb(220, 240, 255);
    border-radius: 4px;
    padding: 8px 16px;
    margin: 6px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    outline: none;
    font-size: 24px;
}
button:hover{
    background: rgb(225, 245, 255);
    border: 1px solid #aaa
}
button:active{
    background: rgb(232, 252, 255);
    border: 1px solid #777
}