body {
    background-color: #f2f4f7;
}

.register-card {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
}

.form-label {
    font-weight: 500;
}

.toggle-password {
    position: absolute;
    right: 15px;
    top: 36px;
    cursor: pointer;
    color: #888;
}

.position-relative {
    position: relative;
}



.envelope {
    width: 100px;
    height: 80px;
    position: relative;
    background: #f2f2f2;
    border: 2px solid #007bff;
    border-radius: 4px;
    overflow: hidden;
    animation: bounce 1.5s infinite;
}
.paper {
    width: 60px;
    height: 40px;
    background: #fd9898;
    position: absolute;
    top: -50px;
    left: 20px;
    animation: flyDown 1.5s infinite;
    border: 1px solid #ccc;
    border-radius: 2px;
}
@keyframes flyDown {
    0% { top: -50px; opacity: 0; }
    50% { top: 15px; opacity: 1; }
    100% { top: -50px; opacity: 0; }
}
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}