body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #f0f9ff, #dbeffd, #b3e5fc);
    color: #333;
}

.websocket-container {
    width: 90%;
    max-width: 600px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

input[type="text"], button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: none;
    border-radius: 5px;
    font-size: 16px;
}

input[type="text"] {
    background: rgba(255, 255, 255, 0.95);
    color: #333;
    border: 1px solid #ddd;
}

input[type="text"]::placeholder {
    color: #aaa;
}

button {
    background: linear-gradient(45deg, #90caf9, #64b5f6);
    color: #fff;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: linear-gradient(45deg, #64b5f6, #90caf9);
}

#pesan {
    width: 100%;
    height: 300px;
    padding: 10px;
    border: 1px solid rgba(220, 220, 220, 0.7);
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.95);
    overflow-y: auto;
    margin-top: 10px;
    color: #333;
}

.received {
    background: linear-gradient(45deg, #c8e6c9, #e8f5e9);
    padding: 10px;
    margin: 5px 0;
    border-radius: 5px;
    word-wrap: break-word;
    color: #333;
}

.sent {
    background: linear-gradient(45deg, #ffecb3, #ffe082);
    padding: 10px;
    margin: 5px 0;
    border-radius: 5px;
    word-wrap: break-word;
    text-align: right;
    color: #333;
}