.size-header{
  width: 50vw;
  margin: 0vh auto;
  background-color: rgb(255, 255, 255);
}

.size-header header{
  margin: 2vw 0vw;
  padding: 0.8vw 0vw;
}

.nav-links{
  padding: 0.5vw 3vw;
  color: var(--navlink-color);
  display: inline-block;
  position: relative;
  text-decoration: none;
  font-size: 1.4vw;
  font-weight: 500;
}

.border-right{
  box-shadow: 9px 0 3px -8px var(--contrast-color);
}

.nav-links:after {
  content: '';
  position: absolute;
  width: 100%;
  transform: scaleX(0);
  height: 0px;
  bottom: 0;
  left: 0;
  background-color: rgba(255, 255, 255, 0);
  box-shadow: 0px 0.1vw 2.5px 1px var(--contrast-color);
  transform-origin: center;
  transition: transform 0.2s ease-in-out;
}
  
.nav-links:hover:after {
  transform: scaleX(0.6);
  transform-origin: center;
}