Missing attribution in map

[daliborjanak]

During the refactoring, we deleted the classes with stilling of attribution in the map. So the attribution is invisible. Please fix that (and also rewrite it to scss..)

From old code:

.ol-attribution{position:absolute;right:0;bottom:0;text-align:right;background:rgba(255,255,255,.8);font-size:10px;line-height:10px;padding:2px;}
.ol-attribution ul{margin:0;padding:0;color:#000;text-shadow:0 0 2px #fff;font-size:10px;line-height:10px;}
.ol-attribution li{display:inline;list-style:none;line-height:inherit}
.ol-attribution li:not(:last-child):after{content:" "}
.ol-attribution a {color:#000;}
.ol-attribution img{display:none;/*margin-bottom:-2px;max-height:12px;*/}
.ol-attribution button{display:none;}
.ol-attribution.ol-logo-only {display:none;}