<div class="checkbox">
    <input type="checkbox" id="checkbox_1">
    <label for="checkbox_1">Pure CSS Checkbox</label>
</div>
body {
    line-height: 24px;
    font-size: 16px;
    box-sizing: border-box;
}

.checkbox input[type="checkbox"] {
    opacity: 0;
}

.checkbox label {
    position: relative;
    display: inline-block;
    
    /*16px width of fake checkbox + 6px distance between fake checkbox and text*/
    padding-left: 22px;
}

.checkbox label::before,
.checkbox label::after {
    position: absolute;
    content: "";
    
    /*Needed for the line-height to take effect*/
    display: inline-block;
}

/*Outer box of the fake checkbox*/
.checkbox label::before{
    height: 16px;
    width: 16px;
    
    border: 1px solid;
    left: 0px;
    
    /*(24px line-height - 16px height of fake checkbox) / 2 - 1px for the border
     *to vertically center it.
     */
    top: 3px;
}

/*Checkmark of the fake checkbox*/
.checkbox label::after {
    height: 5px;
    width: 9px;
    border-left: 2px solid;
    border-bottom: 2px solid;
    
    transform: rotate(-45deg);
    
    left: 4px;
    top: 7px;
}

/*Hide the checkmark by default*/
.checkbox input[type="checkbox"] + label::after {
    content: none;
}

/*Unhide on the checked state*/
.checkbox input[type="checkbox"]:checked + label::after {
    content: "";
}












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