body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: Arial, sans-serif;
    background: #f0f8ff;
}

#login-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px;
    border-radius: 10px;
    background: #fff;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
}

input {
    margin: 5px;
    padding: 8px;
    width: 200px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

button {
    margin: 10px;
    padding: 8px 20px;
    border: none;
    border-radius: 5px;
    background: #87cefa;
    color: #fff;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #00bfff;
}

#errorMsg {
    color: red;
    height: 1.2em;
}

.shake {
    animation: shake 0.3s;
}

@keyframes shake {
    0% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    50% {
        transform: translateX(5px);
    }

    75% {
        transform: translateX(-5px);
    }

    100% {
        transform: translateX(0);
    }
}