bootstrap-fluent-design_template/scss/_forms.scss

// Input
input[type=text],
input[type=password],
input[type=email],
input[type=url],
input[type=time],
input[type=date],
input[type=datetime-local],
input[type=tel],
input[type=number],
input[type=search-md],
input[type=search],
textarea.form-control {
  -webkit-appearance: none;
  border: 1px solid #a9a9a9;
  border-radius: 0;
  padding: 0.375rem 0.75rem;
  outline: none;
  font-weight: 300;
  font-size: 1.1rem;
  color: #616161;
  &:focus {
    border: 1px solid #a9a9a9;
    color: #616161;
    outline: 1px solid #0050c5;
    box-shadow: none;
  }
  &:disabled {
    cursor: not-allowed;
    color: #d2d2d2;
    border-color: #d2d2d2;
    background-color: transparent;
  }
}

textarea {
  font-size: 1rem;
}

label {
  margin-bottom: .3rem;
  transition: color .3s ease-in-out;
  font-size: 1.1rem;
}

// Checkbox & radio
%hide-radio-checkbox {
  position: absolute;
  left: -9999px;
  visibility: hidden;
}

%base-radio-checkbox-label {
  position: relative;
  padding-left: 25px;
  cursor: pointer;
  display: inline-block;
  height: 25px;
  line-height: 25px;
  font-size: 1rem;
  -webkit-user-select: none;
  -moz-user-select: none;
  -khtml-user-select: none;
  -ms-user-select: none;
  &:before,
  &:after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    border-style: solid;
    border-width: 1px;
    margin-top: 1px;
  }
}

// checkbox
input[type="checkbox"] {
  @extend %hide-radio-checkbox;
  +label {
    @extend %base-radio-checkbox-label;
    &:before,
    &:after {
      z-index: 1;
      transition: border .25s, background-color .25s, width .20s .1s, height .20s .1s, top .20s .1s, left .20s .1s;
    }
    &:after {
      // color
      height: 20px;
      width: 20px;
    }
    &:before {
      // arrow
      border-width: 1px;
      transform: (rotateZ(40deg));
      transform-origin: (100% 100%);
    }
  }
  &:not(:checked) {
    +label:before {
      width: 0;
      height: 0;
      border-color: transparent;
      left: 6px;
      top: 10px;
    }
    +label:after {
      background-color: transparent;
      z-index: 0;
    }
  }
  &:checked {
    +label:before {
      top: 0;
      width: 8px;
      height: 16px;
      border-color: transparent white white transparent;
    }
    +label:after {
      border-color: $blue;
      background-color: $blue;
      z-index: 0;
    }
  }
  &:hover+label:after {
    border-color: rgba($black-base, .6);
  }
  &:focus+label:after {
    border-style: dashed;
    border-color: $black-base;
  }
  &:indeterminate {
    +label:before {
      left: -5px;
      top: 5px;
      width: 10px;
      height: 10px;
      border: 5px solid black;
      transform: (rotate(90deg));
      -webkit-backface-visibility: hidden;
      transform-origin: (100% 100%);
    }
    +label:after {
      border-color: $blue;
    }
  }
  &:disabled {
    +label {
      cursor: not-allowed !important;
    }
    &:not(:checked) {
      +label:before {
        background-color: transparent;
        border-color: $grey;
      }
      +label:after {
        border-color: transparent;
        background-color: $grey;
      }
    }
    &:checked {
      +label:before {
        background-color: transparent;
      }
      +label:after {
        background-color: $grey;
        border-color: $grey;
      }
    }
    &:indeterminate {
      +label:after {
        border-color: $grey;
        background-color: transparent;
      }
      +label:before {
        border-color: $grey;
      }
    }
  }
}

// radio
input[type=radio] {
  @extend %hide-radio-checkbox;
  +label {
    @extend %base-radio-checkbox-label;
    &:before,
    &:after {
      z-index: 0;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      border-width: 0.0938rem;
      transition: all .3s ease;
    }
    &:after {
      border: none;
    }
  }
  &:checked {
    +label:after {
      background-color: black;
      transform: (scale(.5));
    }
    &:disabled+label:after {
      background-color: $grey;
    }
  }
  &:disabled {
    +label {
      cursor: not-allowed;
      &:before {
        border-color: $grey;
      }
    }
  }
  /*Border-color*/
  &.with-gap-blue:checked+label:before {
    border-color: $blue !important;
  }
}