.container {
    max-width: 600px;
    margin: 40px auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 30px 20px;
    text-align: center;
}
.ip-class-controls, .slider-section, .result-section, .explanation {
    margin: 20px 0;
}
.slider-section label {
    margin-right: 10px;
}
input[type="range"] {
    width: 300px;
    vertical-align: middle;
}
.result-section {
    font-size: 1.2em;
    margin-top: 30px;
}
.result-section div {
    margin: 10px 0;
}
.ip-range-info {
    color: #888;
    font-size: 0.95em;
    margin-top: 8px;
}
.explanation {
    background: #f8f8f8;
    border-radius: 6px;
    padding: 15px;
    text-align: left;
    font-size: 0.98em;
}