css
<style>
input[type=checkbox] {display: none;}
input[type=checkbox] + label:before {
content: "";
border: 1px solid #000;
font-size: 11px;
line-height: 15px;
margin: 0 5px 0 0;
height: 15px;
width: 15px;
text-align: center;
vertical-align: middle;
display:inline-block;
}
input[type=checkbox]:checked + label:before {
content: "\2713";
}
</style>
html
<font size="3">
<input id="check" type="checkbox" name="check">
<label for="check">Checkbox</label>
</font>