@media (min-width: 576px) {
    .border-sm-0 {border-width: 0;}
    .border-sm-1 {border-style: solid; border-width: 1px;}
    .border-sm-2 {border-style: solid; border-width: 2px;}
    .border-sm-3 {border-style: solid; border-width: 3px;}
    .border-sm-4 {border-style: solid; border-width: 4px;}
    .border-sm-5 {border-style: solid; border-width: 5px;}
}
@media (min-width: 768px) {
    .border-md-0 {border-width: 0;}
    .border-md-1 {border-style: solid; border-width: 1px;}
    .border-md-1 {border-style: solid; border-width: 1px;}
    .border-md-2 {border-style: solid; border-width: 2px;}
    .border-md-3 {border-style: solid; border-width: 3px;}
    .border-md-4 {border-style: solid; border-width: 4px;}
    .border-md-5 {border-style: solid; border-width: 5px;}
}
@media (min-width: 992px) {
    .border-lg-0 {border-width: 0;}
    .border-lg-1 {border-style: solid; border-width: 1px;}
    .border-lg-2 {border-style: solid; border-width: 2px;}
    .border-lg-3 {border-style: solid; border-width: 3px;}
    .border-lg-4 {border-style: solid; border-width: 4px;}
    .border-lg-5 {border-style: solid; border-width: 5px;}
}

@media (min-width: 576px) {
    .rounded-sm-4 {border-radius: 4px;}
    .rounded-sm-8 {border-radius: 8px;}
    .rounded-sm-12 {border-radius: 12px;}
}
@media (min-width: 768px) {
    .rounded-md-4 {border-radius: 4px;}
    .rounded-md-8 {border-radius: 8px;}
    .rounded-md-12 {border-radius: 12px;}
}
@media (min-width: 992px) {
    .rounded-lg-4 {border-radius: 4px;}
    .rounded-lg-8 {border-radius: 8px;}
    .rounded-lg-12 {border-radius: 12px;}
}

.article {
  font-size: 1rem;
}

@media (min-width: 768px) {
  .article {
    font-size: 1.05rem;  /* ~17px */
  }
}

@media (min-width: 992px) {
  .article {
    font-size: 1.2rem; /* ~18px */
  }
}

.article h1 {
  line-height: 1.2;
}

@media (min-width: 768px) {
  .article h1 {
    line-height: 1.4;
  }
}