.multi_state_checkbox_crossed {
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' preserveAspectRatio='none' viewBox='0 0 100 100'><path d='M100 0 L0 100 ' stroke='black' stroke-width='10'/><path d='M0 0 L100 100 ' stroke='black' stroke-width='10'/></svg>");
  background-repeat:no-repeat;
  background-position:center center;
  background-size: 100% 100%, auto;
}

.multi_state_checkbox_label_option, .multi_state_checkbox_label{
  cursor:pointer;
}