.nacitac {
      width: 120px;
      height: 120px;
      top: 50%;
      left:50%;
      z-index: 5000;
      margin-top: -60px;
      margin-left: -60px;      
      border-radius: 50%;
      position: fixed;
      animation: rotate 1s linear infinite
}
.nacitac::before {
	content: "";
	box-sizing: border-box;
	position: absolute;
	inset: 0px;
	border-radius: 50%;
	border: 5px solid #FFF;
	animation: prixClipFix 2s linear infinite ;
}
@keyframes rotate {
	100%   {transform: rotate(360deg)}
}
@keyframes prixClipFix {
	0%   {clip-path:polygon(50% 50%,0 0,0 0,0 0,0 0,0 0)}
	25%  {clip-path:polygon(50% 50%,0 0,100% 0,100% 0,100% 0,100% 0)}
	50%  {clip-path:polygon(50% 50%,0 0,100% 0,100% 100%,100% 100%,100% 100%)}
	75%  {clip-path:polygon(50% 50%,0 0,100% 0,100% 100%,0 100%,0 100%)}
	100% {clip-path:polygon(50% 50%,0 0,100% 0,100% 100%,0 100%,0 0)}
}

#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-primary);
    z-index: 1999;
		background-image: url("https://cdn.myshoptet.com/usr/www.artyrium.cz/user/logos/artyrium-logo-black-2.svg");
    background-size: 50%;
		background-repeat: no-repeat;
		background-position: 50% 28%;
}
@media (max-width: 600px){#overlay{background-size:80%;}}