html {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #333;
    text-align: center;
    color: white;
}

.btn {
    display: inline;
    background-color: rgb(55, 151, 213);
    padding: 10px;
    color: white;
    font-family: "Helvetica Neue";
    margin: 10px;
    margin-bottom: 30px;
    text-decoration: none;
    transition: 0.3s;
}

.btn:hover {
    background-color: #1d75af;
}