.checkbox-custom {
    position: relative;
    width: 16px;
    height: 16px;
    margin: 0;
    display: inline-block;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -o-user-select: none;
    user-select: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    outline: 0;
    cursor:pointer;
}

    .checkbox-custom:after {
        content: '';
        position: absolute;
        display: block;
        z-index: 1;
        width: 16px;
        height: 16px;
        border: 1px solid #847272;
        border-radius: 2px;
    }

    .checkbox-custom[type=checkbox]:before {
        background: #f6ac4f url("http://i.imgur.com/dR1TM0y.png");
        background-size: 10px 8px;
        background-repeat: no-repeat;
        background-position: 3px 4px;
        position: absolute;
        left: 2px;
        z-index: 2;
        opacity: 0;
        width: 100%;
        height: 100%;
        color: #f6ac4f;
    }

    .checkbox-custom[type=checkbox]:checked:before {
        content: '';
        position: absolute;
        top: 0px;
        opacity: 1;
        left: 0px;
        border: 1px solid #f6ac4f;
        border-radius: 2px;
    }