.solar {-webkit-transition-duration: 500ms;-moz-transition-property: opacity; }
.solar:hover{-webkit-filter: brightness(0.2);
-moz-filter: brightness(0.2);
-o-filter: brightness(0.2);
-ms-filter: brightness(0.2);}
.solar:hover:active{-webkit-filter: brightness(0);
-moz-filter: brightness(0);
-o-filter: brightness(0);
-ms-filter: brightness(0);-webkit-transition-duration: 0s;}