a:link {
    
}
a:visited {
    
}
a:not(.article-header):hover {
    -webkit-animation: strobo 0.17s   infinite alternate; 
    animation: strobo 0.17s   infinite alternate; 
}
.menu tspan{
    font-size: 9em;
    font-family: 'real';
    color: white; 
	margin-right:1em;
}
.menu {
    position: fixed;
    width: 6rem;
    height: 6rem;
    top: calc(50% - 3rem);
    left:calc(50% - 3rem); 
    z-index: 100;
    border-radius: 50%;
    line-height: 1;
}
.menu a:link {
    text-decoration: none;
}
.menu a:visited {
    color: white;
}
.menu a:hover {
    color: white;
}
.menu:hover, .menu:focus  {   
    background-image: none;
    -webkit-transform:scale(6);
    transform:scale(6);
      }
.showback {
    color: white; 
    background-color: black;
    border-radius: 50%;
    -webkit-transition:width 2s, height 2s, background-color 0.2s, -webkit-transform 2s;
    transition:width 2s, height 2s, background-color 0.2s, transform 2s;
}

.menu:hover .maskanimation {
    -webkit-mask-image: radial-gradient(circle, black 50%, rgba(0, 0, 0, 0) 50%);
    mask-image: radial-gradient(circle, black 50%, rgba(0, 0, 0, 0) 50%);
    mask-position: center center;
    mask-repeat: no-repeat;
    webkit-animation: maskanimation 0.5s linear 1 normal forwards;
    animation: maskanimation 0.5s linear 1 normal forwards;
}
 .show {
    height: 100%;
    width: 100%;
    transform: scale(0.01);
    transform-origin: center center; 
}
.menu:hover .show {
    display: block;
    transform: scale(1);
 }
      
@-webkit-keyframes maskanimation {
        0% {
          mask-size: 1% 1%;
          mask-position: center center;
        }
        100% {
          mask-position: center center;
          mask-size: 150% 150%;
        }
}
 @keyframes maskanimation {
        0% {
          mask-size: 1% 1%;
          mask-position: center center;
        }
        100% {
          mask-position: center center;
          mask-size: 150% 150%; 
        }
}
@-webkit-keyframes strobo {
      0% {
       -webkit-filter: none;
          }
      100% {
      -webkit-filter: invert(1);
          }
}
@keyframes strobo {
      0% {
      color: rgb(0,0,0);
       filter: invert(0%);
          }
      100% {
      color: rgb(255,255,255);
      filter: invert(100%);
         }
}
.star{
    position: absolute;
    height: 80%;
    width: 80%;
    top: calc(50% - 40%);
    left: calc(50% - 40%);
    background-image: url(https://mariuskonvoj.cz/wp-content/themes/konvoj-frame/assets/images/start.svg);
    background-repeat: no-repeat;
    background-position: center; 
    transition: all 1s ease;
    border-radius: 40%;
  }
.menu:hover .star {
    display: block;
    pointer-events: auto;
    transform: scale(0.8);
 }
.overlay {
    position: fixed;
    top: calc(50% - 6rem);
    left: calc(50% - 6rem);
    width: 12rem;
    height: 12rem;
    background-color: rgba(0, 0, 0, 1);
    transform: scale(0.01, 0.01);
    pointer-events: none;
    transition: all 1s ease;
    border-radius: 50%;
    transition-delay: 1s;  
}
.menu:hover .overlay {
    background-color: rgba(0, 0, 0, 1);
    display: block;
    pointer-events: auto;
    transform: scale(8, 8);  
}
@media only screen and (max-width: 600px) {
	.menu {
    width: 4rem;
    height: 4rem;
    top: calc(50% - 2rem);
    left:calc(50% - 2rem);    
	}
	.star{
    height: 90%;
    width: 90%;
    top: calc(50% - 45%);
    left: calc(50% - 45%);
	border-radius: 100%;	
	}

}