nav {
  display: grid;
  grid-auto-flow: column;
  grid-gap: 1em;
}
 
.a_menu {
  position: relative;
  font-weight: 800;
  text-decoration: none;
  color: white;
  transition: color .3s ease;
  font-size: 1.5em;
}

.a_menu::after {
  --scale: 0;
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 3px;

  background: white;
  -webkit-transform: scaleX(var(--scale));
          transform: scaleX(var(--scale));
  -webkit-transform-origin: var(--x) 50%;
          transform-origin: var(--x) 50%;
  transition: -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);
  transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);
  transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1), -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);
}
.a_menu:hover {
  color: white;
}
.a_menu:hover::after {
  --scale: 1;
} 




.a_menu:visited {
    color: white;
    text-decoration: none;
}

.a_menu:link {
    color: white;
    padding: 0%;
    text-decoration: none;
}