html, body {
    height: 100%;
}
.authentication {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    text-align: center;
}
.form{
    min-width: 300px;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
    border: 1px solid #e9e9e9;
}

label {
    font-size: 22px;
    padding-top: 15px;
    padding-bottom: 15px;
    position: relative;
    top: 0;
    color: white;
    display: block;
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
    background-color: #3b5998;
}
input{
    width: 80%;
    margin: 15px;
    border: 1px solid #e9e9e9;
    border-radius: 3px;
    font-size: 18px;
    padding-left: 7px;
    padding-right: 7px;
    display: block;
    margin-top: 25px;
    margin-bottom: 25px;
}
#submit{
    width: 30%;
    border: none;
    background-color: #3b5998;
    color: white;
    padding-left: 15px;
    padding-right: 15px;
    padding-top: 5px;
    border-radius: 0;
}