.ck-editor__main .ck-content li.icon-close {
    background-image: url(/themes/custom/peruviantrekexpeditions/img/custom-icons/icon-close.svg);
    background-position: left center;
    background-size: 20px 15px;
    background-repeat: no-repeat;
    list-style-type: none;
    padding-left: 25px !important;
    line-height: 2em;
    margin-left: -20px;
}

.ck-editor__main .ck-content li.icon-check {
    background-image: url(/themes/custom/peruviantrekexpeditions/img/custom-icons/icon-check.svg);
    background-position: left center;
    background-size: 20px 15px;
    background-repeat: no-repeat;
    list-style-type: none;
    padding-left: 25px !important;
    line-height: 2em;
    margin-left: -20px;
}