.client-list ol {
    list-style: none;
    counter-reset: my-awesome-counter;
}
.client-list li {
    counter-increment: my-awesome-counter;
    margin: 0.25rem;
}
.client-list li::before {
    content: counter(my-awesome-counter);
    background: #662974;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: inline-block;
    line-height: 2rem;
    color: white;
    text-align: center;
    margin-right: 0.5rem;
}
.client-list ol ol li::before {
    background: #DE51FF;
}
.client-list ol ol ol li::before {
    background: #EE9EFF;
}