.content-main {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}


.card {
    width: 300px;
    border: 0 !important;
}

.app {
    background-color: rgb(255, 255, 255);
}

footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    color: white;
    text-align: center;
}

.form-control.is-valid, .was-validated .form-control:valid {
    border-color: #ced4da;
    padding-right: 0;
    background-image: none;
    background-repeat: no-repeat;
    background-position: 0;
    background-size: 0;
}

    .form-control.is-valid:focus, .was-validated .form-control:valid:focus {
        color: #495057;
        background-color: #fff;
        border-color: #80bdff;
        outline: 0;
        box-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
    }

.form-control.is-invalid, .was-validated .form-control:invalid {
    border-color: #dc3545;
    padding-right: calc(1.5em + .75rem);
    background-image: none;
    background-position: 0;
    background-size: 0;
}