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CSS

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HTML 

              
                <div class="btnWrapper">
  <button class="pri_btn">Button</button>
  <button class="sec_btn">Button</button>
  <button class="tri_btn">Button</button>
  <br /><br />
  <button class="pri_btn bigBtn">Button X2</button>
  <button class="sec_btn bigBtn">Button X2</button>
  <button class="tri_btn bigBtn">Button X2</button>
</div>

<div class="btnWrapper greyBg">
  <button class="pri_btn iconBtn"><i class="material-icons">open_in_new</i>Button</button>
  <button class="sec_btn iconBtn"><i class="material-icons">open_in_new</i>Button</button>
  <button class="tri_btn iconBtn"><i class="material-icons">open_in_new</i>Button</button>
  <br /><br />
  <button class="pri_btn bigBtn iconBtn"><i class="material-icons">open_in_new</i>
    Button X2</button>
  <button class="sec_btn bigBtn iconBtn"><i class="material-icons">open_in_new</i>Button X2</button>
  <button class="tri_btn bigBtn iconBtn"><i class="material-icons">open_in_new</i>Button X2</button>
</div>

<div class="btnWrapper">
  <div class="splitBtn"><button class="pri_btn">Button</button><button class="pri_btn drop"><i class="material-icons">arrow_left</i>
    </button></div>
  <div class="splitBtn"><button class="sec_btn">Button</button><button class="sec_btn drop"><i class="material-icons">arrow_left</i>
    </button></div>
  <div class="splitBtn"><button class="tri_btn">Button</button><button class="tri_btn drop"><i class="material-icons">arrow_left</i>
    </button></div>
  <br /><br />
  <div class="splitBtn bigBtn"><button class="pri_btn">Button</button><button class="pri_btn drop"><i class="material-icons">arrow_left</i>
    </button></div>
  <div class="splitBtn bigBtn"><button class="sec_btn">Button</button><button class="sec_btn drop"><i class="material-icons">arrow_left</i>
    </button></div>
  <div class="splitBtn bigBtn"><button class="tri_btn">Button</button><button class="tri_btn drop"><i class="material-icons">arrow_left</i>
    </button></div>
</div>
!

CSS 

              
                :root {
  --bgColor: #0fddaf;
  --txtColor: #ffffff;
  --borColor: rgba(0, 0, 0, 0);
  --sizeVar: 8px;
}
button {
  font-family: "Roboto", sans-serif;
  font-size: calc(var(--sizeVar) * 1.75);
  font-weight: 500;
  border: none;
  outline: none;
  margin: var(--sizeVar);
  padding: var(--sizeVar) calc(var(--sizeVar) * 2);
  border-radius: calc(var(--sizeVar) / 2);
  cursor: pointer;
  background-color: var(--bgColor);
  color: var(--txtColor);
  box-shadow: 0 0 0 1px var(--borColor) inset;
}
.sec_btn {
  --bgColor: #869cff;
}
.tri_btn {
  --bgColor: #ffffff;
  --txtColor: #4b4760;
  --borColor: #cccccc;
}
button:focus {
  --borColor: rgba(0, 0, 0, 0.4);
}
button:hover {
  --bgColor: #1fcc9e;
}
.sec_btn:hover {
  --bgColor: #6279e7;
}
.tri_btn:hover {
  --bgColor: #f8f7f8;
}
button:active {
  --bgColor: #1db284;
}
.sec_btn:active {
  --bgColor: #5468c7;
}
.tri_btn:active {
  --bgColor: #e7e7e7;
}

.btnWrapper {
  padding: 20px 20px 0 20px;
  margin: 20px;
  height: fit-content;
}
.greyBg {
  background-color: #f6f6f6;
}
.splitBtn {
  margin: var(--sizeVar);
  width: fit-content;
  float: left;
}
.splitBtn button {
  margin: 0;
  border-radius: calc(var(--sizeVar) / 2) 0 0 calc(var(--sizeVar) / 2);
}
.splitBtn .drop {
  padding: var(--sizeVar) calc(var(--sizeVar) * 1.5);
  border-radius: 0 calc(var(--sizeVar) / 2) calc(var(--sizeVar) / 2) 0;
  margin-left: calc(var(--sizeVar) / -8);
}
.splitBtn button:focus {
  transform: translateZ(calc(var(--sizeVar) / 8));
}
.drop .material-icons {
  transform: rotate(-90deg) scale(2) translateX(calc(var(--sizeVar) / -8));
}
.splitBtn:nth-of-type(4) {
  clear: left;
}
.bigBtn {
  transform: scale(2);
  margin: calc(var(--sizeVar) * 7);
}
.bigBtn.iconBtn,
.splitBtn.bigBtn {
  margin: calc(var(--sizeVar) * 7.5);
}
.iconBtn i {
  margin-right: calc(var(--sizeVar) / 2);
}
@font-face {
  font-family: "Material Icons";
  font-style: normal;
  font-weight: 400;
  src: url(https://example.com/MaterialIcons-Regular.eot); /* For IE6-8 */
  src: local("Material Icons"), local("MaterialIcons-Regular"),
    url(https://example.com/MaterialIcons-Regular.woff2) format("woff2"),
    url(https://example.com/MaterialIcons-Regular.woff) format("woff"),
    url(https://example.com/MaterialIcons-Regular.ttf) format("truetype");
}
.material-icons {
  font-size: calc(var(--sizeVar) * 1.5);
  transform: translateY(calc(var(--sizeVar) / 8));
}
body {
  user-select: none;
}
!

JS
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