input[type=checkbox] + label {
    display: block;
    margin: 0.2em;
    cursor: pointer;
    padding: 0.2em;
}

input[type=checkbox] {
    display: none;
}

    input[type=checkbox] + label:before {
        content: "\2714";
        border: 0.1em solid #000;
        display: inline-block;
        border-radius: 0.2em;
        width: 1.5em;
        height: 1.5em;
        padding-left: 0.2em;
        padding-bottom: 0.3em;
        margin-right: 0.2em;
        vertical-align: bottom;
        color: transparent;
        transition: .2s;
    }

    input[type=checkbox] + label:active:before {
        transform: scale(0);
    }

    input[type=checkbox]:checked + label:before {
        background-color: rgb(74,86,46);
        border-color: rgb(74,86,46);
        color: #fff;
    }

    input[type=checkbox]:disabled + label:before {
        transform: scale(1);
        border-color: #aaa;
    }

    input[type=checkbox]:checked:disabled + label:before {
        transform: scale(1);
        background-color: #bfb;
        border-color: #bfb;
    }