Esto es barra de desplazamiento personalizada en css

 /* Gmail style scrollbar */
 ::-webkit-scrollbar {
   width: 12px
 }
 ::-webkit-scrollbar-thumb {
   border-width: 1px 1px 1px 2px
 }
 ::-webkit-scrollbar-track {
   border-width: 0
 }
 ::-webkit-scrollbar {
   height: 16px;
   overflow: visible;
   width: 16px;
 }
 ::-webkit-scrollbar-button {
   height: 0;
   width: 0;
 }
 ::-webkit-scrollbar-track {
   background-clip: padding-box;
   border: solid transparent;
   border-width: 0 0 0 4px;
 }
 ::-webkit-scrollbar-track:horizontal {
   border-width: 4px 0 0
 }
 ::-webkit-scrollbar-track:hover {
   background-color: rgba(220, 172, 0, .05);
   box-shadow: inset 1px 0 0 rgba(220, 172, 0, .1);
 }
 ::-webkit-scrollbar-track:horizontal:hover {
   box-shadow: inset 0 1px 0 rgba(220, 172, 0, .1)
 }
 ::-webkit-scrollbar-track:active {
   background-color: rgba(220, 172, 0, .05);
   box-shadow: inset 1px 0 0 rgba(220, 172, 0, .14), inset -1px 0 0 rgba(220, 172, 0, .07);
 }
 ::-webkit-scrollbar-track:horizontal:active {
   box-shadow: inset 0 1px 0 rgba(220, 172, 0, .14), inset 0 -1px 0 rgba(220, 172, 0, .07)
 }
 ::-webkit-scrollbar-thumb {
   background-color: rgba(220, 172, 0, .2);
   background-clip: padding-box;
   border: solid transparent;
   border-width: 1px 1px 1px 6px;
   min-height: 28px;
   padding: 100px 0 0;
   box-shadow: inset 1px 1px 0 rgba(220, 172, 0, .1), inset 0 -1px 0 rgba(220, 172, 0, .07);
 }
 ::-webkit-scrollbar-thumb:horizontal {
   border-width: 6px 1px 1px;
   padding: 0 0 0 100px;
   box-shadow: inset 1px 1px 0 rgba(220, 172, 0, .1), inset -1px 0 0 rgba(220, 172, 0, .07);
 }
 ::-webkit-scrollbar-thumb:hover {
   background-color: rgba(220, 172, 0, .4);
   box-shadow: inset 1px 1px 1px rgba(220, 172, 0, .25);
 }
 ::-webkit-scrollbar-thumb:active {
   background-color: rgba(220, 172, 0, 0.5);
   box-shadow: inset 1px 1px 3px rgba(220, 172, 0, 0.35);
 }
 ::-webkit-scrollbar-track {
   border-width: 0 1px 0 6px
 }
 ::-webkit-scrollbar-track:horizontal {
   border-width: 6px 0 1px
 }
 ::-webkit-scrollbar-track:hover {
   background-color: rgba(220, 172, 0, .035);
   box-shadow: inset 1px 1px 0 rgba(220, 172, 0, .14), inset -1px -1px 0 rgba(220, 172, 0, .07);
 }
 ::-webkit-scrollbar-thumb {
   border-width: 0 1px 0 6px
 }
 ::-webkit-scrollbar-thumb:horizontal {
   border-width: 6px 0 1px
 }
 ::-webkit-scrollbar-corner {
   background: transparent
 }
 body::-webkit-scrollbar-track-piece {
   background-clip: padding-box;
   background-color: #f5f5f5;
   border: solid #fff;
   border-width: 0 0 0 3px;
   box-shadow: inset 1px 0 0 rgba(220, 172, 0, .14), inset -1px 0 0 rgba(220, 172, 0, .07);
 }
 body::-webkit-scrollbar-track-piece:horizontal {
   border-width: 3px 0 0;
   box-shadow: inset 0 1px 0 rgba(220, 172, 0, .14), inset 0 -1px 0 rgba(220, 172, 0, .07);
 }
 body::-webkit-scrollbar-thumb {
   border-width: 1px 1px 1px 5px
 }
 body::-webkit-scrollbar-thumb:horizontal {
   border-width: 5px 1px 1px
 }
 body::-webkit-scrollbar-corner {
   background-clip: padding-box;
   background-color: #f5f5f5;
   border: solid #fff;
   border-width: 3px 0 0 3px;
   box-shadow: inset 1px 1px 0 rgba(220, 172, 0, .14);
 }

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<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris   placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus   enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis. Praesent dapibus, neque id cursus faucibus, tortor neque egestas augue, eu vulputate magna eros eu erat. Aliquam erat volutpat. Nam dui mi, tincidunt quis, accumsan porttitor, facilisis   luctus, metus</p>

Utilizo el código anterior para embellecer mi barra de desplazamiento, pero no quiero estilizar mi barra vertical.

Intenté eliminar las etiquetas que no contienen "horizontal" pero no funciona.