.step {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 2px solid gray;
    background-color: lightgray;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.active {
    background-color: blue;
    color: white;
    border-color: blue;
}