styles.css

a.button {
    display: inline-block;
    padding:0.3em 1.2em;
    margin:0 0.3em 0.3em 0;
    border-radius:2em;
    box-sizing: border-box;
    text-decoration:none;
    font-family:'Roboto',sans-serif;
    font-weight:300;
    color:#FFFFFF;
    background-color:#7E7F9A;
    text-align:center;
    transition: all 0.2s;
}
a.button:hover {
    background-color: #5d5e72;
    cursor: pointer;
}
@media all and (max-width:30em){
     a.button {
        display:block;
        margin:0.2em auto;
    }

    .main {
        padding-left: 5vw;
        padding-right: 5vw;
    }
}

.container {
    margin: 10px;
    text-align: center;
}

.form {
    margin-top: 30px;
    margin-bottom: 30px;
}
.form > label {
    display: block;
    margin: 10px;
}

.checking {
    background-color: #272838;
    color: #F9F8F8;
}

.success {
    background-color: #E0EFDE;
    color: #272838;
}

body {
    font-family: Verdana, sans-serif;
}

input {
    padding: 5px;
    font-size: 36px;
    text-align: center;
}

.large-space {
    padding: 20px;
}

.large-font {
    font-size: 24px;
}

a {
    color: #7E7F9A;
}

.bottom {
    position: fixed;
    bottom: 0;
    padding: 10px;
    text-align: center;
}

@media only screen and (max-width: 600px) {
    .main {
        padding-left: 5vw;
        padding-right: 5vw;
    }
    .top-space {
        height: 10vh;
    }
} 

@media only screen and (min-width: 600px) {
    .main {
        padding-left: 20vw;
        padding-right: 20vw;
    }
    .top-space {
        height: 20vh;
    }
}

.hidden {
    display: none;
}