Don't want to learn Bootstrap classes? Go to Bootstrap builder for busy developers.

Bootstrap class: .border-*-0

<span class="p-1 border border-primary border-0">Hello World</span>
<span class="p-1 border border-primary border-top-0">Hello World</span>
<span class="p-1 border border-primary border-right-0">Hello World</span>
<span class="p-1 border border-primary border-bottom-0">Hello World</span>
<span class="p-1 border border-primary border-left-0">Hello World</span>

Preview

Hello World Hello World Hello World Hello World Hello World

Sass source

/* _borders.scss:13 */
.border-0        { border: 0 !important; }
.border-top-0    { border-top: 0 !important; }
.border-right-0  { border-right: 0 !important; }
.border-bottom-0 { border-bottom: 0 !important; }
.border-left-0   { border-left: 0 !important; }

@each $color, $value in $theme-colors {
  .border-#{$color} {
    border-color: $value !important;
  }
}

Uses variables

/* _borders.scss:13 */
$color
$value
$theme-colors
$color}
$value