.vertical-menu {
  width: 175px;
  <!--padding: 2px;-->
} 

.vertical-menu a {
  background-color: #eee;
  color: #0b34ce;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  margin: 20px 20px 10px 20px;
  text-decoration: none;
  font-size: 55%;
  font-weight: normal;
  font-family: Sans-serif;
  border-width: 1px;
  border-style: solid;
  border-color: #faa00b;
  height: 1px;
  overflow: hidden;
  border-radius: 3px; /* ¡Aquí aplicamos el redondeo! */
  }
  
 

.vertical-menu a:hover {
  background-color: #ffefe0;
}

.vertical-menu a.active {
  background-color: #04AA6D;
  color: white;
}