itsblue-website/themes/itsblue/scss/theme/_forms.scss

form {
  .button-wrapper {
    margin-top: 0.75rem;
    margin-bottom: 1rem;
  }

  /* Button */

	.btn {
		background-color: transparent;
		border: 0;
		border-radius: 0;
		box-shadow: inset 0 0 0 2px $border-color;
		color: $dark-color !important;
		cursor: pointer;
		display: inline-block;
		font-size: 0.9em;
		font-weight: _font(weight-bold);
		height: 3em;
		letter-spacing: _font(kerning-alt);
		line-height: 3em;
		padding: 0 2.5em;
		text-align: center;
		text-decoration: none;
		text-transform: uppercase;
		white-space: nowrap;

    font-size: 12pt;

    @include breakpoint(md) {
      font-size: 9pt;
    }

		&:hover {
      box-shadow: inset 0 0 0 2px $primary-color;
		  background-color: transparent;

			&:active {
				background-color: transparentize($primary-color, 0.85);
			}
		}

		&.icon {
			padding-left: 1.35em;

			&:before {
				margin-right: 0.5em;
			}
		}

		&.fit {
			display: block;
			width: 100%;
		}

		&.small {
			font-size: 0.8em;
		}

		&.big {
			font-size: 1.35em;
		}

		&.btn-primary {
			background-color: $primary-color;
			box-shadow: none;

			color: $light-color !important;
      
      &:hover {
			  background-color: darken($primary-color, 10);

				&:active {
					background-color: lighten($primary-color, 10);
				}
			}
		}
  }

  /* Inputs */

  .form-label {
    display: none;
  }

  span.required {
    color: $error-color;
    font-weight: 700;
    font-size: 1.2rem;
  }

  .form-input[type=range] {
    appearance: slider-horizontal;
    &:focus {
      box-shadow: none;
      border: none;
    }
  }

  .form-input[type=text],
  .form-input[type=email],
  textarea.form-input {
    background: lighten($dark-color, 62);
    border: 0;
    border-radius: 0;
    color: $dark-color;
    display: block;
    outline: 0;
    padding: 1em;
    text-decoration: none;
    width: 100%;
    height: 2.75em;
    text-size-adjust: 1.5;
    font-size: 15pt;

    @include breakpoint(md) {
      font-size: 11pt;
    }

    &::placeholder {
      color: $dark-color;
      opacity: .5;
    }

    &:invalid {
            box-shadow: none;
    }

    &:focus {
            box-shadow: inset 0 0 0 2px $primary-color;
    }
  }

  textarea.form-input {
    padding: .65em 1em;
    height: 7em;
    resize: vertical;
  }

  .form-field.half {
    float: left;
    width: 50%;
    @include breakpoint(sm) {
      float: none;
      width: 100%;
    }
  }

  .form-field.half.left {
    padding: 0 .65em 0 0;
    @include breakpoint(sm) {
      padding: 0;
    }
  }

  .form-field.half.right {
    padding: 0 0 0 .65em;
    @include breakpoint(sm) {
      padding: 0;
    }
  }

  /** Reset some defaults for Quark Theme **/
  .form-group:not(.form-field-toggleable) {
    .checkboxes {
      display: inherit;

      label {
        display: inherit;
        padding: (($control-size-sm - $line-height) / 2) $control-padding-x (($control-size-sm - $line-height) / 2) ($control-icon-size + $control-padding-x);
        margin: inherit;

        &:before {
          display: none;
        }
      }
    }
  }

  .form-group:not(:last-child) {
    margin-bottom: 1.2rem;
  }

}

#grav-login {

  > form {
    margin: 2rem auto 0;
    max-width: 350px;
  }
  .form-label {
    display: none;
  }
  .form-data {
    margin: 1rem 0;
  }
  .form-input {
    text-align: center;
  }
  .button-wrapper {
    text-align: right;

    .form-data.rememberme {
      margin: 0;
      float: left;
    }
  }

  .login-form {
    button[type="submit"] {
      @include button-primary;
    }
  }

  .twofa-form {
    button[type="submit"]:first-child {
      @include button-primary;
      float: right;
      margin-left: 4px;
    }
  }
}