body {
    background: url('/bg.jpg') no-repeat center center fixed;
    background-size: cover;
}

h1 {
    text-align: center;
}

header div, main {
    border-radius: 10px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    max-width: 600px;
    inset: 0px;
    margin: auto;
}

main {
    z-index: -1;
    background: white;
    padding: 1rem;
    max-height: 450px;
    position: fixed;
}

#logo {
    width: 150px;
    height: 150px;
    margin: auto;
    display: block;
    filter: invert(94%) sepia(61%) saturate(6613%) hue-rotate(176deg) brightness(101%) contrast(101%);
}

@media screen and (width < 576px) {
    h1 {
        font-size: 24px;
    }

    #logo {
        width: 100px;
        height: 100px;
    }
}

form {
    text-align: center;
}

input, .btn {
    margin: 0.5rem auto;
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
}

input[type=submit] {
    border: none;
}

input[type=email] {
    border: 1px solid #dee2e6;
    width: 100%;
    font-size: 2rem;
    transition: border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}

input[type=email]:focus {
    border-color: #86b7fe;
    box-shadow: 0 0 0 .25rem rgba(13,110,253,.25);
    outline: 0;
}

input::placeholder {
    color: rgba(33, 37, 41, 0.75);
    opacity: 0.5;
}

.alert {
    padding: 1rem;
    border: 1px solid;
    border-radius: 0.375rem;
    margin: 1em auto;
    vertical-align: center;
}

.alert.danger {
    color: #58151c;
    background: #f8d7da;
    border-color: #f1aeb5;
}

.alert.success {
    color: #0a3622;
    background: #d1e7dd;
    border-color: #a3cfbb;
}

.alert.warning {
    color: #664d03;
    background: #fff3cd;
    border-color: #ffe69c;
}

a {
    text-decoration: none;
    color: #0b5ed7;
}

a:hover {
    text-decoration: underline;
}

a.btn:hover {
    text-decoration: none;
}

.btn {
    font-size: 2rem;
    cursor: pointer;
    color: #ffffff;
}

.btn.primary {
    background-color: #0d6efd;
    border: #0d6efd 1px solid;
}

.btn.primary:hover {
    background-color: #0b5ed7;
    border-color: #0b5ed7;
}

.btn.secondary {
    background: #6c757d;
    border-color: #6c757d;
}

.btn.secondary:hover {
    background: #5c636a;
    border-color: #565e64;
}

.btn.danger {
    background: #dc3545;
    border-color: #6c757d;
}

.btn.danger:hover {
    background: #bb2d3b;
}

.center {
    margin-top: 3rem;
    text-align: center;
}