body {
    font-family: Arial, sans-serif;
    display: flex;
    margin: 0;
    min-height: 100vh;
    background-color: #f0f2f5;
    color: #333;
}

.customizer-panel {
    width: 280px;
    background-color: #fff;
    padding: 20px;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.customizer-panel h2 {
    margin-top: 0;
    color: #0056b3;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.control-group label {
    font-weight: bold;
    font-size: 0.9em;
}

.control-group input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    height: 8px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    transition: opacity .2s;
    border-radius: 5px;
}

.control-group input[type="range"]:hover {
    opacity: 1;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #007bff;
    cursor: pointer;
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #007bff;
    cursor: pointer;
}

.control-group span {
    text-align: right;
    font-size: 0.8em;
    color: #555;
}

.main-content {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

#customizable-block {
    background-color: #ffffff;
    border: 1px solid #cceeff; /* Light blue border to define content block */
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 600px;
    transition: all 0.1s ease-out; /* Smooth transitions for changes */
}

#customizable-block h3 {
    color: #0056b3;
    margin-top: 0;
}

#customizable-block p {
    line-height: 1.6;
    margin-bottom: 20px;
}

#customizable-block button {
    background-color: #007bff;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.2s;
}

#customizable-block button:hover {
    background-color: #0056b3;
}