ul.checkmark {
    position: relative;
}

ul.checkmark li {
    margin-left: 3rem;
    max-width: 20rem;
}

ul.checkmark li:before {
    position: absolute;
    background-size: cover;
    content: " ";
    width: 2rem;
    height: 2rem;
    border-radius: 100%;
    left: 0;
}

ul.col {
    display: flex;
    flex-wrap: wrap;
    padding: 0;
    flex-direction: column;
}
ul.col li {
    max-width: calc(50% - 20px);
    margin-right: 20px;
}

@media (max-width: 650px) {
    ul.col li {
        max-width: 100%;
        margin-right: 0;
    }
}