.invalid-feedback {
    display: block;
}
.b2 {
    width: calc( 100% - 430px);
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    text-align: center;
}
.login-title {
    text-transform: uppercase;
    color: #fff;
    font-weight: bold;
    font-size: 50px;
    margin-top: 100px;
    text-shadow: 0 0 4px #333333;
}

#login_bg, #register_bg, #admission_bg {

}

.popup {
    position: fixed;
    top: 50%;
    left: 50%;
    padding: 20px;
    background: #fff;
    display: none;
    width: 600px;
    z-index: 100;
    margin-left: -300px;
    margin-top: -100px;
    box-shadow: 0 0 5px #333;
}