body, html {
    height: 100%;
    margin: 0;
    overflow: hidden;
}

.bg-video {
    position: fixed;
    top: 0;
    left: 0;
    min-width: 100%;
    min-height: 100%;
    object-fit: cover;
    z-index: -1;
}

.login-container,
.register-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-box,
.register-box {
    background-color: rgba(0, 0, 0, 0.75);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 0 10px rgba(0,0,0,0.8);
    color: #fff;
    width: 100%;
    max-width: 400px;
}

.btn-yellow {
    background-color: #ffc107;
    border: none;
    font-weight: bold;
}