:root {
    /* larger checkbox */
}
:root label.checkbox-bootstrap input[type=checkbox] {
    position: absolute;
    /* hide original check box */

    opacity: 0;
    /* find the nearest span with checkbox-placeholder class and draw custom checkbox */
    /* draw checkmark before the span placeholder when original hidden input is checked */
    /* disabled checkbox style */
    /* disabled and checked checkbox style */
    /* when the checkbox is focused with tab key show dots arround */
}
:root label.checkbox-bootstrap input[type=checkbox] + span.checkbox-placeholder {
    display: inline-block;
    width: 14px;
    height: 14px;
    margin: 0 7px 0 0;

    cursor: pointer;
    text-align: center;
    vertical-align: middle;

    border: 1px solid;
    /*checkbox border color*/
    border-color: #737373;
    border-radius: 3px;
}
:root label.checkbox-bootstrap input[type=checkbox]:checked + span.checkbox-placeholder {
    background: #0ccce4;
}
:root label.checkbox-bootstrap input[type=checkbox]:checked + span.checkbox-placeholder:before {
    position: relative;

    display: inline-block;
    width: 5px;
    height: 9px;

    content: "";
    /*can be done with post css autoprefixer*/
    -webkit-transform: rotate(45deg);
       -moz-transform: rotate(45deg);
        -ms-transform: rotate(45deg);
         -o-transform: rotate(45deg);
            transform: rotate(45deg);
    vertical-align: text-top;
    /*checkmark arrow color*/

    border: solid white;
    border-width: 0 2px 2px 0;
}
:root label.checkbox-bootstrap input[type=checkbox]:disabled + span.checkbox-placeholder {
    border-color: #c3c2c2;
    background: #ececec;
}
:root label.checkbox-bootstrap input[type=checkbox]:checked:disabled + span.checkbox-placeholder {
    border-color: #bdbdbd;
    background: #d6d6d6;
}
:root label.checkbox-bootstrap input[type=checkbox]:focus:not(:hover) + span.checkbox-placeholder {
    outline: 1px dotted black;
}
:root label.checkbox-bootstrap.checkbox-lg input[type=checkbox] + span.checkbox-placeholder {
    width: 26px;
    height: 26px;

    border: 2px solid;
    /*checkbox border color*/
    border-color: #737373;
    border-radius: 5px;
}
:root label.checkbox-bootstrap.checkbox-lg input[type=checkbox]:checked + span.checkbox-placeholder:before {
    width: 9px;
    height: 15px;
    /*checkmark arrow color*/

    border: solid white;
    border-width: 0 3px 3px 0;
}