ol3-layerswitcher.css in Openlayers 7.3

.layer-switcher {
  position: absolute;
  top: 3.5em;
  right: 0.5em;
  text-align: left;
}

.layer-switcher .panel {
  padding-right: 50px;
  border: 1px solid #cccccc;
  background-color: white;
  margin: 0;
  display: none;
}

.layer-switcher.shown .panel {
  display: block;
}

.layer-switcher button {
  float: right;
  width: 38px;
  height: 38px;
  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAACE1BMVEX///8A//8AgICA//8AVVVAQID///8rVVVJtttgv98nTmJ2xNgkW1ttyNsmWWZmzNZYxM4gWGgeU2JmzNNr0N1Rwc0eU2VXxdEhV2JqytQeVmMhVmNoydUfVGUgVGQfVGQfVmVqy9hqy9dWw9AfVWRpydVry9YhVmMgVGNUw9BrytchVWRexdGw294gVWQgVmUhVWPd4N6HoaZsy9cfVmQgVGRrytZsy9cgVWQgVWMgVWRsy9YfVWNsy9YgVWVty9YgVWVry9UgVWRsy9Zsy9UfVWRsy9YgVWVty9YgVWRty9Vsy9aM09sgVWRTws/AzM0gVWRtzNYgVWRuy9Zsy9cgVWRGcHxty9bb5ORbxdEgVWRty9bn6OZTws9mydRfxtLX3Nva5eRix9NFcXxOd4JPeINQeIMiVmVUws9Vws9Vw9BXw9BYxNBaxNBbxNBcxdJexdElWWgmWmhjyNRlx9IqXGtoipNpytVqytVryNNrytZsjZUuX210k5t1y9R2zNR3y9V4lp57zth9zdaAnKOGoaeK0NiNpquV09mesrag1tuitbmj1tuj19uktrqr2d2svcCu2d2xwMO63N+7x8nA3uDC3uDFz9DK4eHL4eLN4eIyYnDX5OM5Z3Tb397e4uDf4uHf5uXi5ePi5+Xj5+Xk5+Xm5+Xm6OY6aHXQ19fT4+NfhI1Ww89gx9Nhx9Nsy9ZWw9Dpj2abAAAAWnRSTlMAAQICAwQEBgcIDQ0ODhQZGiAiIyYpKywvNTs+QklPUlNUWWJjaGt0dnd+hIWFh4mNjZCSm6CpsbW2t7nDzNDT1dje5efr7PHy9PT29/j4+Pn5+vr8/f39/f6DPtKwAAABTklEQVR4Xr3QVWPbMBSAUTVFZmZmhhSXMjNvkhwqMzMzMzPDeD+xASvObKePPa+ffHVl8PlsnE0+qPpBuQjVJjno6pZpSKXYl7/bZyFaQxhf98hHDKEppwdWIW1frFnrxSOWHFfWesSEWC6R/P4zOFrix3TzDFLlXRTR8c0fEEJ1/itpo7SVO9Jdr1DVxZ0USyjZsEY5vZfiiAC0UoTGOrm9PZLuRl8X+Dq1HQtoFbJZbv61i+Poblh/97TC7n0neCcK0ETNUrz1/xPHf+DNAW9Ac6t8O8WH3Vp98f5lCaYKAOFZMLyHL4Y0fe319idMNgMMp+zWVSybUed/+/h7I4wRAG1W6XDy4XmjR9HnzvDRZXUAYDFOhC1S/Hh+fIXxen+eO+AKqbs+wAo30zDTDvDxKoJN88sjUzDFAvBzEUGFsnADoIvAJzoh2BZ8sner+Ke/vwECuQAAAABJRU5ErkJggg==') /*logo.png*/;
  background-repeat: no-repeat;
  background-position: 2px;
  background-color: white;
  border: none;
}

.layer-switcher button:focus, .layer-switcher button:hover {
  background-color: white;
}

.layer-switcher label {
  display: inline;
}

.layer-switcher ul {
  padding-left: 1em;
  list-style: none;
}

.layer-switcher li.group {
  padding-top: 5px;
}

.layer-switcher li.group > label {
  font-weight: bold;
}

.layer-switcher input {
  margin: 4px;
}