style.css

.{
    box-sizing: border-box;
}
body{
    background-color: #1abc9c;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
}
.container{
    background-color: rgb(38, 23, 46);
    height: 200px;
    width: 70px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-direction: column;
    padding: 15px;
}

.circle{
    height: 40px;
    width: 40px;
    border-radius: 50px;
    background-color: rgba(0,0,0,0.3);

    position: relative;
}
.circle:after{
   
    border-right: 4px solid rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    top: 5px;
    content: '';
    position: absolute;
    width: 30px;
    height: 30px;

}
.circle.red{
    background-color: #c0392b;
    box-shadow: 0 0 20px 5px #c0392b;
}
.circle.yellow{
    background-color: #f1c40f;
    box-shadow: 0 0 20px 5px #f1c40f;
}
.circle.green{
    background-color: #2ecc71;
    box-shadow: 0 0 20px 5px #2ecc71;
}