form {
    width: 30vw;
}

form a {
    color: #70689d;
}

form .btn {
    width: 100%;
}

#formugonder {
    text-align: center;
    text-decoration: none;
    color: #70689d;
    background-color:gainsboro;
    padding: 15px 40px;
    border: 1px solid #70689d;
    border-radius: 5px;
    font-size: 18px;
    margin-top: 10px;
    width: 100%;
}

#formugonder:hover {
    background-color:#70689d;
    color: white;
}

@media screen and (max-width:1200px) {
    form {
        width: 40vw;
    }
}

@media screen and (max-width:900px) {
    form {
        width: 60vw;
    }
}