body {
    font-family: 'Roboto';font-size: 22px;
    font-weight: 400;
    background-image: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEdnlBCvr8LzFq-1FYwT45p-JI9PBeq3-O3A5hpoONdr8X61idhiETLaLt3KrbvAScejC7pPJ6m8HdWYWkHT3rGJqe0UvIFREau40Uo5w4KSrI6wA09mzJzA67m2gCMxPpSk8khny5uOdz4dkaeE0t4BdmtnbxFrg81QFFItXtEVCdLq5oKEGNrtXDmWY/s16000/desktop-wallpaper-abstract-black-blue-dark-blue-and-black-abstract-background.jpg);
    background-size: cover;  
    background-repeat: no-repeat;
    background-position: center;
    background-attachment: fixed;
    height: 100%;
}

a, button,input[type=submit],input[type=reset] {
    font-family: sans-serif;
    font-size: 15px;
    background: #FFD700;
    color: black;
    border: #800000 3px solid;
    border-radius: 5px;
    padding: 18px 28px;
    margin-top: 10px;
}
a {
    text-decoration: none;
}
a:hover, button:hover, input[type=submit]:hover, input[type=reset]:hover{
    opacity:0.9;
}