You can use the following CSS code to block any action on the site for the click of a button or for any other purpose.
CSS:
.overlay {
/*display:none*/
position: fixed;
width: 100%;
height: 100%;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: rgba(0,0,0,0.5);
z-index: 2;
cursor: pointer;
}
JavaScript:
// To activate the CSS Code;
$("body").addClass("overlay")
// CSS Kodunu kapatmak için;
$("body").removeClass("overlay")