input[type="checkbox"] {
    position: absolute;
    left: -999em;
}
input[type="checkbox"]:checked + label::after {
    content: "";
    position: absolute;
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
    width: 1rem;
    height: 0.5rem;
    background: rgba(0, 0, 0, 0);
    top: 0.625rem;
    left: 0.5rem;
    border: 3px solid red;
    border-top: none;
    border-right: none;
}
input[type="checkbox"] + label {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    padding-left: 2.375rem;
}
input[type="checkbox"] + label::before {
    content: "";
    position: absolute;
    left: 0;
    display: inline-block;
    vertical-align: -25%;
    height: 1.75rem;
    width: 2rem;
    background-color: #fff;
    border-radius: 0.25rem;
    margin-right: 0.5rem;
}
html[dir="rtl"] input[type="checkbox"]:checked + label::after {
    -webkit-transform: scaleX(-1) rotate(45deg);
    transform: scaleX(-1) rotate(45deg);
}