AdGuardHome/client/src/components/ui/Checkbox.css

.checkbox {
    display: inline-block;
    margin: 0;
}

.checkbox--single {
    display: block;
    margin: 2px auto 6px;
}

.checkbox--single .checkbox__label:before {
    margin-right: 0;
}

.checkbox--settings .checkbox__label:before {
    top: 2px;
    margin-right: 20px;
}

.checkbox--settings .checkbox__label-title {
    margin-bottom: 2px;
    font-weight: 600;
}

.checkbox--form .checkbox__label:before {
    top: 1px;
    margin-right: 10px;
}

.checkbox__label {
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    font-size: 14px;
    font-weight: 400;
    user-select: none;
    cursor: pointer;
}

.checkbox__label:before {
    content: '';
    position: relative;
    top: 1px;
    display: inline-block;
    vertical-align: middle;
    width: 20px;
    height: 20px;
    min-width: 20px;
    margin-right: 10px;
    background-color: var(--checkbox-bg);
    background-repeat: no-repeat;
    background-position: center center;
    background-size: 12px 10px;
    border-radius: 3px;
    transition:
        0.3s ease-in-out box-shadow,
        0.3s ease-in-out opacity;
}

.checkbox__label .checkbox__label-text {
    line-height: 1.3;
}

.checkbox__label .checkbox__label-text .md__paragraph {
    display: inline-block;
    vertical-align: baseline;
    margin: 0;
    text-align: left;
    line-height: 1.3;
}

.checkbox__input {
    position: absolute;
    opacity: 0;
}

.checkbox__input:checked + .checkbox__label:before {
    background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMi4zIDkuMiIgZmlsbD0ibm9uZSIgc3Ryb2tlPSIjMDAwIiBzdHJva2UtbGluZWNhcD0icm91bmQiPjxwYXRoIGQ9Ik0xMS44IDAuNUw1LjMgOC41IDAuNSA0LjIiLz48L3N2Zz4=);
}

.checkbox__input:focus + .checkbox__label:before {
    box-shadow: 0 0 1px 1px rgba(74, 74, 74, 0.32);
}

.checkbox__input:disabled + .checkbox__label {
    cursor: default;
    color: var(--gray);
}

.checkbox__input:disabled + .checkbox__label:before {
    opacity: 0.6;
}

.checkbox__label-text {
    max-width: 515px;
    line-height: 1.5;
}

.checkbox__label-text--long {
    max-width: initial;
}

.checkbox__label-title {
    display: block;
    line-height: 1.5;
}

.checkbox__label-subtitle {
    display: block;
    line-height: 1.5;
    color: var(--scolor);
}