/* Ausschnitt */

.container {
    position: relative;
    width: 600px;
    height: 600px;
    margin: 20px auto;
}

.viewport {
    position: absolute;
    top: 0;
    left: 0;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    overflow: hidden;
    background-color: rgba(255, 255, 255, 0.9);
}

.point {
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: red;
    transform: translate(-50%, -50%);
}

.center-point {
    width: 12px;
    height: 12px;
    background-color: blue;
    z-index: 10;
    border: 2px solid white;
    position: absolute;
    transform: translate(-50%, -50%);
}

button {
    margin-top: 20px;
    padding: 12px 24px;
    font-size: 18px;
    cursor: pointer;
    background-color: #45a049;
    color: white;
    border: none;
    border-radius: 4px;
}