kspace-wordpress-theme/scss/core/_icons.scss

.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  stroke-width: 0;
  stroke: currentColor;
  fill: currentColor;
  color: currentColor;
}

.card-header .icon {
  vertical-align: bottom;
}

.toolbar .icon {
  position: relative;
  top: 0.2em;
}

.btn.btn-small .icon, .label .icon {
  position: relative;
  top: 0.1em;
}