static/scss/lib/forms.scss
@mixin button {
  @include body;
  display: inline-block;
  padding: 15px 40px;
  border-radius: 2px;
  background-color: get-color(green);
  color: get-color(white);
  text-decoration: none;
  border: 0;
  cursor: pointer;

  &[disabled] {
    background-color: get-color(gray);
    color: get-color(white);
    cursor: default;
  }
}

@mixin button--small {
  @include body;
  @include body--inverse;
  padding: 10px 20px;
}

@mixin button--inverse {
  background-color: transparent;
}

@mixin button--round {
  border-radius: 50%;
  height: 45px;
  width: 45px;
  border: 1px solid get-color(dark-green);
  padding: 0;
  box-sizing: border-box;

  // Round buttons should never have text
  color: rgba(get-color(black), 0);
  font-size: 0;
}

@mixin button--neutral {
  border-color: get-color(gray);
  background-color: get-color(light-gray);
}

@mixin button--critical {
  border-color: get-color(dark-red);
  background-color: get-color(red);
}

@mixin label {
  @include body;
  @include body--large;
  display: block;
  color: get-color(dark-green);
  padding-bottom: spacing(1);
}

@mixin textbox {
  @include body;
  display: block;
  padding: spacing(1);
  border: 1px solid get-color(gray);
  width: 33%;
}

@mixin input-group {
  margin: spacing(2) 0;

  & label {
    @include label;
  }

  & input[type="text"] {
    @include textbox;
  }
}
