<div class="multi-button">
  <button>Cut</button>
  <button>Copy</button>
  <button>Paste</button>
</div>

// hey - change this color here to see changes! It can be hex, RGB, etc!
$main-color: hsl(330, 88%, 67%);

// start
$adjust: 30;
$shadow: 0.75rem;
$d: 150ms;
$br: 1rem;
@function yiq($color) {
  $dark: #123;
  $light: #DEF;
  $r: red($color);
  $g: green($color);
  $b: blue($color);
  $yiq: (($r*299) + ($g*587) + ($b*114))/1000; 
  @if ($yiq >= 128) {
    @return $dark;
  }
  @else {
    @return $light;
  }
}
@mixin btn-color($color: $main-color, $adj: $adjust) {
  background-color: $color;
  background-image: radial-gradient(
    ellipse at top right,
    adjust-color($color, $hue: $adj),
    rgba($color, 0) 67%
  );
  box-shadow: 0 $shadow 0 darken($color, 25%);
  color: yiq($color);
  text-shadow: 0 -0.1em 0 rgba(yiq(yiq($color)), 0.5);
}
@mixin btn($color: $main-color, $adj: $adjust) {
  @include btn-color($color, $adj);
  $focus: adjust-color($color, $hue: $adj*3);
  &:hover,
  &:focus {
    outline: none;
    @include btn-color($focus);
  }
  &:active {
    box-shadow: 0 0 0;
    opacity: 0.67;
    outline: none;
    top: $shadow;
  }
}
body {
  height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  //
  background-color: #345;
}
.multi-button {
  display: flex;
  position: relative;
  border-radius: $br;
  box-shadow: 0 2rem 1rem -1rem #123;
}
button {
  appearance: none;
  border: 0;
  font: 2rem/1 monospace;
  margin: 0;
  overflow: hidden;
  padding: 1rem 1.25rem;
  position: relative;
  top: 0;
  transition: $d;
  @include btn;
  &:first-child,
  &:last-child {
    border-radius: $br;
  }
  &:first-child {
    border-bottom-right-radius: 0;
    border-top-right-radius: 0;
  }
  &:nth-child(2) {
    $c: adjust-color($main-color, $hue: $adjust);
    @include btn($c);
  }
  &:last-child {
    $c: adjust-color($main-color, $hue: $adjust*2);
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;
    @include btn($c);
  }
}