body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
}

.container {
    display: flex;
    flex-wrap: wrap;
    width: 300px;
}

.circle {
    width: 80px;
    height: 80px;
    margin: 10px;
    background-color: #4CAF50;
    border-radius: 50%;
}

.red-circle {
    background-color: #FF0000;
}