#h1_container {
  display: flex;
  align-items: center;
  justify-content: center;
}
#h1_container > h1 {
  font-size: var(--h6);
  font-family: var(--font-bold);
  color: var(--color1);
  display: inline-block;
  margin-bottom: 1.5rem;
  padding-bottom: 6px;
  position: relative;
}
#h1_container > h1::before {
  --offset: 30%;
  content: "";
  height: 1px;
  width: calc( 100% + var(--offset) );
  background-color: white;
  position: absolute;
  left: calc( -0.5 * var(--offset) );
  bottom: 0;
}