body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f4f7f6;
}

.container {
    background-color: #ffffff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 600px;
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

.controls {
    margin-bottom: 30px;
    text-align: left;
}

#timezone-select {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    margin-left: 10px;
    font-size: 16px;
    cursor: pointer;
}

.time-display {
    font-size: 3.5em;
    font-weight: 300;
    color: #3498db;
    padding: 20px;
    background-color: #ecf0f5;
    border-radius: 8px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}