Buttons, link buttons, and interaction animation

HTML

              
                <main>

<div class=bg-paper></div>

<h1>Buttons, link buttons, and interaction animation</h1>

<section>
  <h2>HTML:</h2>
  <p>Full description: <a target=_blank title="[new window]" class=lnk  href="https://websemantics.uk/articles/shiny-buttons/">Shiny CSS buttons</a></p>
  <div class=container>

    <button class=btn--rect--white-gray>Doing something</button>

    <a href="#" class=btn--rect--white-gray>Going somewhere</a>

    <button class=btn--rect--white-blue>Doing something</button>

    <a href="#" class=btn--rect--white-red>Going somewhere</a>

    <button class=btn--rect--white-green>Doing something</button>

    <a href="#" class=btn--rect--white-purple>Going somewhere</a>

    <button class=btn--rect--white-white>Not accessible</button>

    <a href="#" class=btn--rect--black-black>Not accessible</a>

    <button class=btn--rect--black-white>Doing something</button>

    <a href="#" class=btn--rect--white-cyan>Not accessible</a>

    <button class=btn--rect--black-cyan>Doing something</button>

    <a href="#" class=btn--rect--white-twitter>Not accessible</a>

    <button class=btn--rect--black-twitter>Doing something</button>

    <a href="#" class=btn--rect--white-orange>Not accessible</a>

    <button class=btn--rect--black-orange>Doing something</button>
  
  </div>
</section>


<section>
  <h2>SVGs as CSS background-images (overlaid shadow):</h2>
  <p>Conversion: <a target=_blank title="[new window]" class=lnk href="https://websemantics.uk/tools/svg-to-background-image-conversion/">SVG to CSS background-image converter</a></p>
  <div class=container>
  
    <a href="#" class=btn--rnd--cssbg-twitter>Twitter</a>

    <a href="#" class=btn--rnd--cssbg-facebook>Facebook</a>

    <a href="#" class=btn--rnd--cssbg-linkedin>Linked In</a>

    <a href="#" class=btn--rnd--cssbg-googleplus>Google+</a>

    <a href="#" class=btn--rnd--cssbg-codepen>Codepen</a>

  </div>
</section>


<section>
  
  <h2>SVGs embedded in HTML (underlaid shadow):</h2>
  
  <div class=container>

    <button class=btn--rnd--svg-question><svg><use xlink:href="#icon-question"></use></svg></button>

    <button class=btn--rnd--svg-close><svg><use xlink:href="#icon-close"></use></svg></button>

<!--     <button class=btn--rnd--svg-info><svg><use xlink:href="#icon-info"></use></svg></button> -->
  
    <a href="#" class=btn--rnd--svg-twitter><svg><use xlink:href="#twitter"</svg></a>

    <a href="#" class=btn--rnd--svg-facebook><svg><use xlink:href="#facebook"</svg></a>

    <a href="#" class=btn--rnd--svg-linkedin><svg><use xlink:href="#linkedin"</svg></a>

    <a href="#" class=btn--rnd--svg-googleplus><svg><use xlink:href="#googleplus"</svg></a>

    <a href="#" class=btn--rnd--svg-codepen><svg><use xlink:href="#codepen"</svg></a>

  </div>
</section>
      
      
<svg class=visually-hidden>
  <defs>
    
    <symbol viewbox="0 0 48 48" id="twitter">
      <path d="M15.2 31.44c2.4 0 4.47-.74 6.1-2.08-2.22 0-4-1.5-4.6-3.43.3.15.6.15.9.15.44 0 .88 0 1.33-.15-2.23-.44-3.87-2.38-3.87-4.76.75.3 1.5.6 2.23.6-1.36-.9-2.25-2.38-2.25-4.02 0-.9.15-1.8.6-2.53 2.38 2.98 6.1 4.9 10.12 5.06-.15-.3-.15-.6-.15-1.04 0-2.68 2.23-4.9 4.9-4.9 1.35 0 2.7.58 3.58 1.47 1.2-.27 2.24-.57 3.14-1.17-.3 1.05-1.05 2.1-2.1 2.68 1.05-.14 1.95-.3 2.84-.73-.6 1.04-1.5 1.78-2.53 2.53v.58c0 6.55-4.9 14-14 14-2.67 0-5.2-.9-7.43-2.24h1.2z"/>
    </symbol>
    
    <symbol viewbox="0 0 48 48" id="facebook">
      <path d="M19.6 15.4c0-1.4 0-3.6 1-5C21.8 9 23.2 8 25.8 8c4.2 0 6 .6 6 .6l-.8 4.8s-1.3-.4-2.5-.4c-1.3 0-2.5.4-2.5 1.8v3.8h5.2l-.4 4.8h-5V40h-6.2V23.4h-3.4v-4.8h3.4v-3.2z"/>
    </symbol>
    
    <symbol viewbox="0 0 48 48" id="linkedin">
      <path d="M18.37 19.97V36h-5V19.96h5zm7.96 2.2c.66-1.27 2.3-2.6 4.7-2.6 5.05 0 5.98 3.32 5.98 7.64V36h-4.96v-7.8c0-1.86-.03-4.25-2.58-4.25-2.6 0-3 2.03-3 4.12V36H21.5V19.96h4.76v2.2h.07zM15.88 12c1.6 0 2.88 1.3 2.88 2.9 0 1.6-1.3 2.88-2.88 2.88-1.6 0-2.9-1.3-2.9-2.88 0-1.6 1.3-2.9 2.9-2.9z"/>
    </symbol>
    
    <symbol viewbox="0 0 48 48" id="googleplus">
      <path d="M8.04 23.47c.1-5.5 5.16-10.33 10.66-10.15 2.64-.12 5.12 1.03 7.14 2.64-.86.98-1.75 1.92-2.7 2.8-2.43-1.67-5.9-2.15-8.32-.2-3.47 2.4-3.63 8.06-.3 10.65 3.26 3 9.4 1.5 10.3-3-2.03 0-4.07 0-6.1-.03-.02-1.2-.02-2.4-.02-3.63h10.22c.2 2.87-.17 5.9-1.93 8.27-2.7 3.74-8 4.84-12.2 3.24S7.62 28 8 23.5zm25.82-4.1h3.04c0 1 0 2.04.02 3.06 1.02 0 2.04 0 3.05.02v3.04h-3.05c0 1 0 2-.02 3h-3.04c0-1 0-2.03-.02-3.04-1.02 0-2.04 0-3.05-.03V22.4l3-.02v-3.03z"/>
    </symbol>
    
    <symbol viewbox="0 0 48 48" id="codepen">
      <path d="M24.6 8.5c-.3-.4-.8-.5-1.6 0L8.7 18c-.4 0-.7.4-.7 1.2v9.5c0 .7.3 1 .7 1.3L23 39.6c.7.3 1.3.3 1.6 0L39.3 30c.5-.3.7-.8.7-1.3v-9.5c0-1-.7-1.2-.7-1.2L24.6 8.5zm-2 27.6L12 29l4.7-3.2 6 4.2v6zm2.7 0v-6l6-4 4.7 3-10.5 7zM24 27l-4.8-3 4.8-3.2 4.8 3.2-4.8 3zm-13.3-5.3l3.7 2.3-3.7 2.2v-4.5zm26.6 4.5L33.6 24l3.7-2.3v4.5zm-12-14.4L36 19.2l-4.7 3.2-6-4v-6.6zm-2.6 0v6.4l-6 4.2-4.8-3.2L22.2 12v-.2z"/>
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    </symbol>
    
    <symbol viewBox="0 0 48 48" id="icon-close">
      <path d="M24 21.3l6.3-6.2 2.7 3-6.3 6 6.3 6.6-2.7 2.7L24 27l-6 6-3-2.6 6.5-6.3-6.3-6 3-3 6.2 6.6z"/>
    </symbol>

    <symbol viewBox="0 0 48 48" id="icon-info">
      <path class="x" d="M12 21.7h24v4.6H12z"></path>
      <path class="x" d="M21.7 12h4.6v24h-4.6z"></path>
      <path class="o" d="M25.4 16.97c-.76 0-1.78.42-2.26.42-.95 0-5.62-1.2-6.38.3-.57 1.12-.2 1.7.76 1.9.57 0 2.84-.2 3.6.55.57.4.57 1.7.57 2.46v11.6c0 .58.1 2.47-1 2.66-1.18.2-4-.75-4 1.33 0 .4.2.9.4 1.1.92 1.1 2.62.2 3.8.2 2.23 0 6 .2 8.42.2.37 0 1.5-.4 1.88-.8 1.15-2.08-2.26-1.7-3-1.9-.38 0-.57 0-.76-.18-1.7-1.14-.95-2.85-.95-4.55l.2-12.3c0-.97.16-2.44-.95-3-.12-.03-.23-.04-.36-.04z"></path>
      <circle class="o" cx="23" cy="11" r="4"></circle>
    </symbol>

    <filter id="bg-paper"><feTurbulence type="fractalNoise" baseFrequency="0.05" stitchTiles="stitch" numOctaves="3" result="noise"/><feDiffuseLighting in="noise" lighting-color="#fff" surfaceScale="1" result="diffLight"><feDistantLight azimuth="35" elevation="60"/></feDiffuseLighting></filter>
    
  </defs>
</svg>

</main>

<!-- Footer codepen include -->
[[[https://codepen.io/2kool2/pen/mKeeGM]]]

CSS

              
                /* Generic styling */
*, *::after, *::before {
  box-sizing: border-box;
}
body {
  position: relative;
  font-family: sans-serif;
  line-height: 1.5;
  background-color: #e4dcca;
  margin: 0;
}
main {
  height: 100%;
  padding: 1rem 2rem;
  overflow: auto;
}
h1,h2 {font-weight: 400}
h1 {margin-bottom: 1rem}
h2,p {margin: 1rem 0}
.visually-hidden{position:absolute;overflow:hidden;clip:rect(0 0 0 0);height:1px;width:1px;margin:-1px;padding:0;border:0}
.lnk {
  color: #000 !important;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: all .3s ease-out;
  outline: 0 solid transparent;
}
.lnk:hover,
.lnk:focus {
  background-color: #fff;
  outline: .25em solid #fff;
}
.bg-paper {
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  filter: url(#bg-paper);
}
.container {
  display:flex;
  justify-content: space-around;
  align-content: center;
  flex-wrap: wrap;
}

/* Shine yer buttons guv? */

button::-moz-focus-inner {
  padding: 0 !important;
  border: 0 none !important;
}
[class^="btn"] {

  white-space: pre;
  overflow: visible;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-appearance: button;
  -webkit-appearance: none;

  text-rendering: optimizeLegibility;
  will-change: transform, box-shadow, text-shadow;
  
  /* Safari fix for thin text on hover */
  -webkit-font-smoothing: subpixel-antialiased;
 
  position: relative;
  display: inline-block;
  font-size: inherit;
  font-weight: 100;
  line-height: 3em;
  text-align: center;
  text-decoration: none !important;
  cursor: pointer;
  margin: 1rem;
  outline: 0 solid;
  border: 1px solid;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.25),
    0 1px 0 rgba(255, 255, 255, 0.25) inset,
    0 0 0 rgba(0, 0, 0, 0.5) inset,
    0 1.25em 0 rgba(255, 255, 255, 0.08) inset,
    0 -1.25em 1.25em rgba(0, 0, 0, 0.3) inset,
    0 1.25em 1.25em rgba(255, 255, 255, 0.1) inset;
  transition: box-shadow 0.3s ease-out,  transform 0.3s ease-out;
}
[class^="btn--rect"] {
  padding: 0 1rem;
  border-radius: .25rem;
}
[class^="btn--rnd"] {
  padding: 0;
  border-radius: 50%;
}

[class^="btn"]:hover {
  box-shadow:
    0 .25em .5em rgba(0, 0, 0, 0.5),
    0 1px 0 rgba(255, 255, 255, 0.25) inset,
    0 0 0 rgba(0, 0, 0, 0.25) inset,
    0 1.25em 0 rgba(255, 255, 255, 0.03) inset,
    0 -1.25em 1.25em rgba(0, 0, 0, 0.15) inset,
    0 1.25em 1.25em rgba(255, 255, 255, 0.05) inset;
}
[class^="btn"]:focus {
  outline: 0 solid;
/*   outline: 4px solid #0ff; */
  box-shadow:
    0 .125em .5em rgba(0, 0, 0, 1),
    0 1px 0 rgba(255, 255, 255, 0.25) inset,
    0 0 0 rgba(0, 0, 0, 0.25) inset,
    0 1.25em 0 rgba(255, 255, 255, 0.03) inset,
    0 -1.25em 1.25em rgba(0, 0, 0, 0.15) inset,
    0 1.25em 1.25em rgba(255, 255, 255, 0.05) inset;
}

[class^="btn--rect"]:hover {
  will-change: transform, box-shadow, text-shadow;
  transform: scale(1.02);
}
[class^="btn--rnd"]:hover {
  will-change: transform, box-shadow;
  transform: scale(1.15);
}
[class^="btn"].-js-clicked {
  animation: btn-pressed .3s ease-out forwards;
}

@keyframes btn-pressed {
  50% {
    transform: scale(.985);
    box-shadow:
      0 0 0 rgba(255, 255, 255, 0),
      0 1px 0 rgba(255, 255, 255, 0) inset,
      0 0 .5em rgba(0, 0, 0, 0.5) inset,
      0 1.25em 0 rgba(255, 255, 255, 0.03) inset,
      0 -1.25em 1.25em rgba(0, 0, 0, 0.15) inset,
      0 1.25em 1.25em rgba(255, 255, 255, 0.05) inset;
  }
}

[class^="btn--rect"]::before {
  content: "";
  display: block;
  position: absolute;
  background:-webkit-gradient(linear, left top, right top, from(rgba(255,255,255,0)),color-stop(50%, rgba(255,255,255,1)),to(rgba(255,255,255,0)));
background:-webkit-linear-gradient(left, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 50%,rgba(255,255,255,0) 100%);
background:-o-linear-gradient(left, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 50%,rgba(255,255,255,0) 100%);
background:linear-gradient(left, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 50%,rgba(255,255,255,0) 100%);
  padding: 0 12px;
  top: 0;
  left: 15%;
  height: 1px;
  width: 40%;
  box-shadow: 0 1px 5px rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease-in-out 0s;
}
[class^="btn--rect"]:active::before {
  opacity: 0;
}
[class^="btn--rect"]:hover::before,
[class^="btn--rect"]:focus::before {
  left: 45%;
}
/* Button colours defined here */

[class^="btn--"][class*="--white"] {
  color: #fff; 
  font-weight: 100;
  letter-spacing: .025em;
  text-shadow: 0 0 2px #000;
}
[class^="btn--"][class*="--black"] {
  color: #000;
  font-weight: 400;
}

[class^="btn--"][class*="--white-gray"] {
  background-color: #555;
  border-color:  #222;
}

[class^="btn--"][class*="--white-red"] {
  background-color: #f00;
  border-color:  #500;
}
[class^="btn--"][class*="--white-green"] {
  /* Brightest WCAG 2 green with text-shadow */
  background-color: #009700;
  border-color:  #050;
}
[class^="btn--"][class*="--white-blue"] {
  background-color: #00f;
  border-color:  #007;
}

[class^="btn--"][class*="--white-white"] {
  /* Fails WCAG 2 */
  background-color: #fff;
  border-color: #777;
}
[class^="btn--"][class*="--black-black"] {
  /* Fails WCAG 2 */
  background-color: #000;
  border-color: #777;
  text-shadow: 0 0 2px #fff;
}

[class^="btn--"][class*="--white-black"] {
  background-color: #000;
  border-color:  #000;
}
[class^="btn--"][class*="--black-white"] {
  background-color: #fff;
  border-color:  #777;
}

[class^="btn--"][class*="--white-purple"] {
  background-color: #4b3f5e;
  border-color: #291b38;
}

[class^="btn--"][class*="--white-cyan"] {
  /* Fails WCAG 2 */
  background-color: #0ff;
  border-color: #099;
}
[class^="btn--"][class*="--black-cyan"] {
  background-color: #0ff;
  border-color: #099;
}

[class^="btn--"][class*="--white-twitter"] {
  /* Fails WCAG 2 */
  background-color: #1DA1F2;
  border-color: #066;
}
[class^="btn--"][class*="--black-twitter"] {
  background-color: #1DA1F2;
  border-color: #066;
}


[class^="btn--"][class*="--white-orange"] {
  /* Closest WCAG 2 pass to #f60 with textshadow */
  background-color: #d94000; /*#f60;*/
  border-color: #930;
}
[class^="btn--"][class*="--black-orange"] {
  background-color: #f60;
  border-color: #930;
}




/* Social links: CSS backgrounds */

[class^="btn--rnd--cssbg"] {
  background-color: currentColor;
  text-indent: -999rem;
  width: 4rem;
  height: 4rem;
}

.btn--rnd--cssbg-twitter {
  color: hsl(200, 72%, 55%);
  border-color: hsl(200, 72%, 45%);
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 48 48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='%23fff' d='M15.2 31.44c2.4 0 4.47-.74 6.1-2.08-2.22 0-4-1.5-4.6-3.43.3.15.6.15.9.15.44 0 .88 0 1.33-.15-2.23-.44-3.87-2.38-3.87-4.76.75.3 1.5.6 2.23.6-1.36-.9-2.25-2.38-2.25-4.02 0-.9.15-1.8.6-2.53 2.38 2.98 6.1 4.9 10.12 5.06-.15-.3-.15-.6-.15-1.04 0-2.68 2.23-4.9 4.9-4.9 1.35 0 2.7.58 3.58 1.47 1.2-.27 2.24-.57 3.14-1.17-.3 1.05-1.05 2.1-2.1 2.68 1.05-.14 1.95-.3 2.84-.73-.6 1.04-1.5 1.78-2.53 2.53v.58c0 6.55-4.9 14-14 14-2.67 0-5.2-.9-7.43-2.24h1.2z'/%3E%3C/svg%3E");
}

.btn--rnd--cssbg-facebook {
  color: hsl(226, 42%, 41%);
  border-color: hsl(226, 42%, 31%);
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 48 48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='%23fff' d='M19.6 15.4c0-1.4 0-3.6 1-5C21.8 9 23.2 8 25.8 8c4.2 0 6 .6 6 .6l-.8 4.8s-1.3-.4-2.5-.4c-1.3 0-2.5.4-2.5 1.8v3.8h5.2l-.4 4.8h-5V40h-6.2V23.4h-3.4v-4.8h3.4v-3.2z'/%3E%3C/svg%3E");
}

.btn--rnd--cssbg-linkedin {
  color: hsl(199, 100%, 35%);
  border-color: hsl(199, 100%, 25%);
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 48 48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='%23fff' d='M18.37 19.97V36h-5V19.96h5zm7.96 2.2c.66-1.27 2.3-2.6 4.7-2.6 5.05 0 5.98 3.32 5.98 7.64V36h-4.96v-7.8c0-1.86-.03-4.25-2.58-4.25-2.6 0-3 2.03-3 4.12V36H21.5V19.96h4.76v2.2h.07zM15.88 12c1.6 0 2.88 1.3 2.88 2.9 0 1.6-1.3 2.88-2.88 2.88-1.6 0-2.9-1.3-2.9-2.88 0-1.6 1.3-2.9 2.9-2.9z'/%3E%3C/svg%3E");
}

.btn--rnd--cssbg-googleplus {
  color: hsl(7, 71%, 55%);
  border-color: hsl(7, 71%, 45%);
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 48 48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='%23fff' d='M8.04 23.47c.1-5.5 5.16-10.33 10.66-10.15 2.64-.12 5.12 1.03 7.14 2.64-.86.98-1.75 1.92-2.7 2.8-2.43-1.67-5.9-2.15-8.32-.2-3.47 2.4-3.63 8.06-.3 10.65 3.26 3 9.4 1.5 10.3-3-2.03 0-4.07 0-6.1-.03-.02-1.2-.02-2.4-.02-3.63h10.22c.2 2.87-.17 5.9-1.93 8.27-2.7 3.74-8 4.84-12.2 3.24S7.62 28 8 23.5zm25.82-4.1h3.04c0 1 0 2.04.02 3.06 1.02 0 2.04 0 3.05.02v3.04h-3.05c0 1 0 2-.02 3h-3.04c0-1 0-2.03-.02-3.04-1.02 0-2.04 0-3.05-.03V22.4l3-.02v-3.03z'/%3E%3C/svg%3E");
}

.btn--rnd--cssbg-codepen {
  color: #000;
  border-color: #000;
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 48 48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='%23fff' d='M24.6 8.5c-.3-.4-.8-.5-1.6 0L8.7 18c-.4 0-.7.4-.7 1.2v9.5c0 .7.3 1 .7 1.3L23 39.6c.7.3 1.3.3 1.6 0L39.3 30c.5-.3.7-.8.7-1.3v-9.5c0-1-.7-1.2-.7-1.2L24.6 8.5zm-2 27.6L12 29l4.7-3.2 6 4.2v6zm2.7 0v-6l6-4 4.7 3-10.5 7zM24 27l-4.8-3 4.8-3.2 4.8 3.2-4.8 3zm-13.3-5.3l3.7 2.3-3.7 2.2v-4.5zm26.6 4.5L33.6 24l3.7-2.3v4.5zm-12-14.4L36 19.2l-4.7 3.2-6-4v-6.6zm-2.6 0v6.4l-6 4.2-4.8-3.2L22.2 12v-.2z'/%3E%3C/svg%3E");
}



/* Social links: HTML embedded SVG */

[class^="btn--rnd--svg"] {
  fill: #fff;
  background-color: currentColor;
}
[class^="btn--rnd--svg"] > svg {
  display: block;
  width: 4rem;
  height: 4rem;
  pointer-events: none;
  transition: all .3s ease-out;
}

.btn--rnd--svg-question {
  color: #FAFAFD;
  border-width: 2px;
  border-color: #ccc;
  fill: green;
}
.btn--rnd--svg-question:hover,
.btn--rnd--svg-question:focus {
  fill: #418cec;
  border-color: #418cec;
}


.btn--rnd--svg-close {
  color: #FAFAFD;
  border-width: 2px;
  border-color: #ccc;
  fill: green;
}
.btn--rnd--svg-close:hover,
.btn--rnd--svg-close:focus {
  fill: #418cec;
  border-color: #418cec;
}

.btn--rnd--svg-twitter {
  color: hsl(200, 72%, 55%);
  border-color: hsl(200, 72%, 45%);
}

.btn--rnd--svg-facebook {
  color: hsl(226, 42%, 41%);
  border-color: hsl(226, 42%, 31%);
}

.btn--rnd--svg-linkedin {
  color: hsl(199, 100%, 35%);
  border-color: hsl(199, 100%, 25%);
}

.btn--rnd--svg-googleplus {
  color: hsl(7, 71%, 55%);
  border-color: hsl(7, 71%, 45%);
}

.btn--rnd--svg-codepen {
  color: #000;
  border-color: #000;
}

JS

              
                var supportsES6 = (function() {
  // https://gist.github.com/bendc/d7f3dbc83d0f65ca0433caf90378cd95
  try {
    new Function('(a = 0) => a');
    return true;
  }
  catch (err) {
    return false;
  }
}());



var Button_Click_Animation = (function (window, document) {

  'use strict';
  if (!supportsES6) return;

  const buttons = document.querySelectorAll('[class^=btn--]');
  const clickedClass = '-js-clicked';

  const btn_clicked = e => {
    const btn = e.target;
    btn.classList.add(clickedClass);
    btn.addEventListener('animationend', e => {
      btn.classList.remove(clickedClass);
    }, {once: true});
    btn.focus();
  };

  Object.values(buttons).forEach(btn => {
    btn.addEventListener('click', btn_clicked);
    btn.addEventListener('blur', e => {
      e.target.classList.remove(clickedClass);
    });
  });

}(window, document));

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