Bootstrap/scss/utilities/_text.scss

//
// Text
//

// Alignment

.text-justify        { text-align: justify !important; }
.text-nowrap         { white-space: nowrap !important; }
.text-truncate       { @include text-truncate; }

// Responsive alignment

@each $breakpoint in map-keys($grid-breakpoints) {
  @include media-breakpoint-up($breakpoint) {
    .text-#{$breakpoint}-left   { text-align: left !important; }
    .text-#{$breakpoint}-right  { text-align: right !important; }
    .text-#{$breakpoint}-center { text-align: center !important; }
  }
}

// Transformation

.text-lowercase      { text-transform: lowercase !important; }
.text-uppercase      { text-transform: uppercase !important; }
.text-capitalize     { text-transform: capitalize !important; }

// Weight and italics

.font-weight-normal  { font-weight: normal; }
.font-weight-bold    { font-weight: bold; }
.font-italic         { font-style: italic; }

// Contextual colors

.text-muted {
  color: $text-muted;
}

@include text-emphasis-variant('.text-primary', $brand-primary);

@include text-emphasis-variant('.text-success', $brand-success);

@include text-emphasis-variant('.text-info', $brand-info);

@include text-emphasis-variant('.text-warning', $brand-warning);

@include text-emphasis-variant('.text-danger', $brand-danger);

// Misc

.text-hide {
  @include text-hide();
}