body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    transition: background-color 0.5s, color 0.5s;
}

body.dark-theme {
    background-color: #121212;
    color: #ffffff;
}

body.dark-theme .register-container {
    background-color: #1e1e1e;
    color: #ffffff;
    position: relative;
    border-radius: 20px;
    padding: 30px 40px;
    width: 320px;
    text-align: center;
    overflow: hidden;
}

body.light-theme {
    background-color: #f0f0f0;
    color: #000000;
}

body.light-theme .register-container {
    background-color: white;
    color: #000000;
    position: relative;
    border-radius: 20px;
    padding: 30px 40px;
    width: 320px;
    text-align: center;
    overflow: hidden;
}

.register-container {
    position: relative;
    padding: 30px 40px;
    border-radius: 20px;
    width: 320px;
    text-align: center;
    overflow: hidden;
}

.register-container .input-container {
    position: relative;
    width: 100%;
    margin: 12px 0;
}

.register-container input {
    width: 100%;
    padding: 12px;
    border-radius: 5px;
    border: 1px solid #ccc;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
    box-sizing: border-box;
}

.register-container input:focus {
    border-color: #4CAF50;
    box-shadow: 0 0 8px rgba(76, 175, 80, 0.8);
}

.register-container input[type="submit"] {
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 20px;
    transition: background-color 0.3s;
    width: 100%;
}

.register-container input[type="submit"]:hover {
    background-color: #45a049;
}

.toggle-password {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    font-size: 18px;
    color: #999;
}

.toggle-password:hover {
    color: #4CAF50;
}

.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.5s, border 0.5s;
    background-color: #ffffff;
    border: 2px solid #000000;
}

body.light-theme .theme-toggle {
    background-color: #000000;
    border: 2px solid #ffffff;
}

.signin-text {
    color: gray;
    font-size: 14px;
    margin-bottom: 20px;
}

.error-message {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #ff4c4c;
    color: white;
    padding: 15px 20px;
    border-radius: 5px;
    opacity: 0;
    transition: opacity 0.5s ease-in-out, transform 0.5s ease-in-out;
}

.error-message.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.error-message.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
}

.close-error {
    cursor: pointer;
    font-weight: bold;
    margin-left: 10px;
}

.close-error:hover {
    color: #ccc;
}