body.appearance_page_gp-related-posts input[type="checkbox"] {
  display: none;
}

body.appearance_page_gp-related-posts input[type="checkbox"] + label {
  display: inline-block;
  position: relative;
  height: 24px;
  width: 48px;
  background: #e0e0e0;
  border-radius: 24px;
  cursor: pointer;
  -webkit-transition: background 0.3s;
  -o-transition: background 0.3s;
  transition: background 0.3s;
}

body.appearance_page_gp-related-posts input[type="checkbox"] + label::before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  border-radius: 20px;
  background: #fff;
  top: 2px;
  left: 2px;
  -webkit-transition: left 0.3s;
  -o-transition: left 0.3s;
  transition: left 0.3s;
}

body.appearance_page_gp-related-posts input[type="checkbox"]:checked + label {
  background: #0085ba;
  -webkit-transition: background 0.3s;
  -o-transition: background 0.3s;
  transition: background 0.3s;
}

body.appearance_page_gp-related-posts input[type="checkbox"]:checked + label::before {
  left: 26px;
  -webkit-transition: left 0.3s;
  -o-transition: left 0.3s;
  transition: left 0.3s;
}