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CSS

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HTML 

              
                <div class="create">
  <button class="create-button" onclick="openDialog(event)">
      <div class="create-inner"><div class="create-text">Go Create!</div></div>
    </button>
  <svg id="arrow-down-mini" viewBox="0 0 300 154" width="300" height="154"><path id="path" d="m 268.10523,8.8753335 c 0.51266,-0.5435292 2.3001,-2.3345525 3.73347,-3.7539722 1.43337,-1.4194197 2.65706,-2.615199 2.75337,-2.711514 0.0963,-0.096315 0.40793,-0.604345 0.40793,-0.98206 0,-0.377715 -0.15108,-0.725215 -0.40793,-0.98206 -0.25685,-0.256845 -0.60434,-0.40793 -0.98206,-0.40793 -0.37771,0 -0.85363,0.27951 -0.98206,0.40793 -0.12843,0.12842 -2.92998,3.1051319 -5.6204,5.6204 -2.75081,-2.5574243 -5.49196,-5.49198 -5.62039,-5.6204 -0.12843,-0.12842 -0.60434,-0.40793 -0.98206,-0.40793 -0.37771,0 -0.7101,0.13598466 -0.98206,0.39283 -0.27196,0.25684534 -0.42304,0.64211 -0.42304,0.99716 0,0.35505 -0.04,0.5269297 0.39282,0.98206 0.4328,0.4551303 2.08128,2.1020604 3.56285,3.5911816 1.48157,1.4891212 2.78004,2.7937047 2.93385,2.9508386 0.15381,0.1571339 0.69148,0.4195142 1.11877,0.4227298 0.42729,0.00322 0.86184,-0.2119443 1.09694,-0.4992638 z"></path></svg>
  <div class="menu">
    <div class="new-pen">
      <svg class="new-pen-svg" viewBox="0 0 20 20" width="100%" height="100%"><path d="M0 9.002C0 8.45.455 8 .992 8h18.016c.548 0 .992.456.992 1.002v9.996c0 .553-.455 1.002-.992 1.002H.992C.444 20 0 19.544 0 18.998V9.002zm0-8C0 .45.451 0 .99 0h4.02A.99.99 0 0 1 6 1.003v4.994C6 6.551 5.549 7 5.01 7H.99A.99.99 0 0 1 0 5.997V1.003zm7 0C7 .45 7.451 0 7.99 0h4.02A.99.99 0 0 1 13 1.003v4.994C13 6.551 12.549 7 12.01 7H7.99A.99.99 0 0 1 7 5.997V1.003zm7 0C14 .45 14.451 0 14.99 0h4.02A.99.99 0 0 1 20 1.003v4.994C20 6.551 19.549 7 19.01 7h-4.02A.99.99 0 0 1 14 5.997V1.003z"></path></svg>
      <span
        class="new-pen-text">New Pen</span>
    </div>
    <div class="new-pen-from-template">New Pen from Template</div>
    <div class="new-project">
      <svg class="new-project-svg" viewBox="0 0 20 20" width="100%" height="100%"><path d="M7 .995C7 .445 7.447 0 7.999 0H19c.552 0 .999.456.999.995v8.01c0 .55-.447.995-.999.995H8C7.447 10 7 9.544 7 9.005V.995zm0 11.003c0-.551.447-.998.999-.998H19c.552 0 .999.446.999.998v7.004c0 .551-.447.998-.999.998H8A.998.998 0 0 1 7 19.002v-7.004zM0 .992C0 .444.451 0 .99 0h4.02c.546 0 .99.455.99.992v18.016a.996.996 0 0 1-.99.992H.99a.999.999 0 0 1-.99-.992V.992z"></path></svg>New
      Project</div>
    <div class="new-post">
      <svg class="new-post-svg" viewBox="0 0 20 20" width="100%" height="100%"><path d="M0 5c0-.552.455-1 .992-1h18.016c.548 0 .992.445.992 1v14c0 .552-.455 1-.992 1H.992A.994.994 0 0 1 0 19V5zM0 1C0 .447.455 0 .992 0h18.016c.548 0 .992.443.992.999v1.002c0 .552-.455.999-.992.999H.992A.992.992 0 0 1 0 2.001V.999z"></path></svg>New
      Post</div>
  </div>
</div>
!

CSS 

              
                body {
  background: black;
  font-family: "Lato";
}

.create {
  margin: 0 auto;
  position: relative;
  width: 320px;
}

.create-button {
  background: #343436;
  border-radius: 3px;
  border: 3px solid transparent;
  color: white;
  cursor: pointer;
  display: inline-block;
  font-family: "Lato";
  font-size: 1rem;
  font-weight: normal !important;
  text-shadow: none;
  line-height: 1.2;
  min-width: 70px;
  min-height: 18px;
  margin: 0 10px 0 0;
  margin-left: 210px;
  outline: 0;
  padding: 10px 40px 10px 16px;
  position: relative;
  text-overflow: ellipsis;
  text-decoration: none !important;
  text-align: center;
  transition: width 300ms, padding 300ms;
  white-space: nowrap;
}

.create-button:hover {
  background: #4d4d50;
}

.create-button:active {
  margin-top: 1px;
}

.create-button.expanded {
  padding-left: 14px;
  padding-right: 14px;
}

.create-inner {
  overflow: hidden;
  transition: width 300ms;
  width: 48px;
}

.create-text {
  transition: transform 300ms;
  transform: translateX(-24px);
}

.create-inner.expanded {
  width: 76px;
}

.create-text.expanded {
  transform: translateX(0px);
}

#arrow-down-mini {
  fill: #47cf73;
  margin-left: 5px;
  position: absolute;
  left: 24px;
  pointer-events: none;
  top: 20px;
}

.menu {
  opacity: 0;
  transform: translateY(0);
  transition: opacity 50ms 0ms;
}

.menu.show {
  opacity: 1;
  transition: opacity 200ms 200ms;
}

.new-pen {
  color: #555;
  cursor: pointer;
  display: block;
  font-size: 1.2rem;
  font-weight: bold;
  left: 28px;
  padding: 20px;
  pointer-events: none;
  position: absolute;
  text-align: center;
  top: 9px;
  width: 261px;
}

.new-pen:hover {
  background: #444;
  color: white;
}

.new-pen.show {
  pointer-events: all;
}

.new-pen-svg {
  fill: #0ebeff;
  width: 23px;
  height: 23px;
  margin-right: 10px;
}

.new-pen-text {
  vertical-align: top;
}

.new-pen-from-template {
  background: #f7f7f7;
  border-bottom: 1px solid #e2e2e2;
  border-top: 1px solid #e2e2e2;
  color: #666;
  cursor: pointer;
  display: block;
  height: 22px;
  left: 29px;
  padding: 10px;
  position: absolute;
  text-align: center;
  top: 76px;
  width: 280px;
}

.new-pen-from-template:hover {
  background: #444;
  color: white;
}

.new-pen-from-template.show {
}

.new-project {
  border-right: 1px solid #e2e2e2;
  cursor: pointer;
  font-weight: bold;
  height: 24px;
  left: 28px;
  line-height: 24px;
  padding: 10px;
  position: absolute;
  text-align: center;
  top: 120px;
  width: 130px;
}

.new-project:hover {
  background: #444;
  color: white;
}

.new-project.show {
}

.new-project-svg {
  cursor: pointer;
  fill: #ffdd40;
  height: 20px;
  margin-right: 7px;
  position: relative;
  top: -2px;
  vertical-align: middle;
  width: 20px;
}

.new-post {
  cursor: pointer;
  font-weight: bold;
  height: 24px;
  left: 179px;
  line-height: 24px;
  padding: 10px;
  position: absolute;
  text-align: center;
  top: 120px;
  width: 130px;
}

.new-post:hover {
  background: #444;
  color: white;
}

.new-post.show {
}

.new-post-svg {
  fill: #47cf73;
  cursor: pointer;
  height: 20px;
  margin-right: 7px;
  position: relative;
  top: -2px;
  vertical-align: middle;
  width: 20px;
}
!

JS 

              
                function animD(duration, delay, id, value) {
  anime({
    targets: id,
    d: {
      value: value,
      duration: duration,
      delay: delay,
      easing: "easeInOutQuad"
    }
  });
}

function animTranslateX(duration, delay, id, value) {
  anime({
    targets: id,
    translateX: {
      value: value,
      duration: duration,
      delay: delay,
      easing: "easeInOutQuad"
    }
  });
}

function animTranslateY(duration, delay, id, value) {
  anime({
    targets: id,
    translateY: {
      value: value,
      duration: duration,
      delay: delay,
      easing: "easeInOutQuad"
    }
  });
}

function animFill(duration, delay, id, value) {
  anime({
    targets: id,
    fill: {
      value: value,
      duration: duration,
      delay: delay,
      easing: "easeInOutQuad"
    }
  });
}

function openMenu() {
  document.querySelector(".create-button").classList.add("expanded");
  document.querySelector(".create-inner").classList.add("expanded");
  document.querySelector(".create-text").classList.add("expanded");
  document.querySelector(".menu").classList.add("show");
  document.querySelector(".new-pen").classList.add("show");
  document.querySelector(".new-pen-from-template").classList.add("show");
  document.querySelector(".new-project").classList.add("show");
  document.querySelector(".new-post").classList.add("show");
  animTranslateY(300, 0, "#arrow-down-mini", 35);
  animD(
    200,
    100,
    "#path",
    "m 203.96632,156.40793 c 17.25572,-0.0312 58.22657,-0.1762 99.44981,-0.35825 0.23008,-35.02657 0.71253,-63.941156 1.23324,-104.627323 0.35821,-9.633627 0.13321,-10.651298 0.13321,-24.396682 0,-6.230066 0.58338,-11.278463 -0.13321,-27.8128127 -17.114,-0.13709681 -12.69782,0.10391192 -30.71168,-0.5793139 -21.42981,1.3664516 -21.63667,1.29798565 -37.70924,0.68322582 -25.63755,0.068467 -35.72548,0.88853707 -57.39097,0.36277558 -25.31576,0.0278109 -42.00161,-0.29430813 -62.85677,-0.36277558 -23.587869,-0.0684659 -82.552835,0.68322578 -89.635085,0.68322578 -7.082063,0 -15.364052,-0.49006623 -27.978786,0.33025636 0.3665563,19.26741864 0.2667094,20.15604264 0.2667094,26.01219264 0,5.856149 -0.2669757,15.001409 -0.8333344,41.477327 0.3970649,35.678564 1.0661554,45.221444 2.199786,88.229904 51.009115,0.64845 62.172445,0.60118 86.818502,1.22625 24.165048,-0.22428 56.210418,0.0309 64.020168,0.1402 8.21306,-0.003 29.29614,-0.87441 53.12765,-1.0082 z"
  );
  animFill(300, 0, "#arrow-down-mini", "#ffffff");
}

function closeMenu() {
  document.querySelector(".create-button").classList.remove("expanded");
  document.querySelector(".create-inner").classList.remove("expanded");
  document.querySelector(".create-text").classList.remove("expanded");
  document.querySelector(".menu").classList.remove("show");
  document.querySelector(".new-pen").classList.remove("show");
  document.querySelector(".new-pen-from-template").classList.remove("show");
  document.querySelector(".new-project").classList.remove("show");
  document.querySelector(".new-post").classList.remove("show");
  animTranslateY(300, 0, "#arrow-down-mini", 0);
  animD(
    200,
    100,
    "#path",
    "m 268.10523,8.8753335 c 0.51266,-0.5435292 2.3001,-2.3345525 3.73347,-3.7539722 1.43337,-1.4194197 2.65706,-2.615199 2.75337,-2.711514 0.0963,-0.096315 0.40793,-0.604345 0.40793,-0.98206 0,-0.377715 -0.15108,-0.725215 -0.40793,-0.98206 -0.25685,-0.256845 -0.60434,-0.40793 -0.98206,-0.40793 -0.37771,0 -0.85363,0.27951 -0.98206,0.40793 -0.12843,0.12842 -2.92998,3.1051319 -5.6204,5.6204 -2.75081,-2.5574243 -5.49196,-5.49198 -5.62039,-5.6204 -0.12843,-0.12842 -0.60434,-0.40793 -0.98206,-0.40793 -0.37771,0 -0.7101,0.13598466 -0.98206,0.39283 -0.27196,0.25684534 -0.42304,0.64211 -0.42304,0.99716 0,0.35505 -0.04,0.5269297 0.39282,0.98206 0.4328,0.4551303 2.08128,2.1020604 3.56285,3.5911816 1.48157,1.4891212 2.78004,2.7937047 2.93385,2.9508386 0.15381,0.1571339 0.69148,0.4195142 1.11877,0.4227298 0.42729,0.00322 0.86184,-0.2119443 1.09694,-0.4992638 z"
  );
  animFill(300, 0, "#arrow-down-mini", "#47cf73");
}

var open = false;
function openDialog(event) {
  if (!open) {
    openMenu();
  } else {
    closeMenu();
  }
  open = !open;
  event.stopPropagation();
}

document.addEventListener("click", function(event) {
  if (open) {
    closeMenu();
  }
  open = false;
});
!
999px

Console