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HTML 

              
                <h1>CSS Arrows/Triangles Combinations</h1>
<ol class="multiple-triangles">
   <li><div class="side1"></div></li>
   <li><div class="side2"></div></li>
   <li><div class="all4"></div></li>
   <li><div class="top-n-bottom"></div></li>
   <li><div class="left-n-right"></div></li>
   <li><div class="side1 vertical"></div></li>
   <li class="top-bottom-separated pos-ab-element">
      <div class="north"></div>
      <div class="south"></div>
   </li>
   <li class="west-east-separated pos-ab-element">
      <div class="west"></div>
      <div class="east"></div>
   </li>
</ol>
<ol class="diagonal-triangles">
   <li><div class="top-right"></div></li>
   <li><div class="bottom-right"></div></li>
   <li><div class="bottom-left"></div></li>
   <li><div class="top-left"></div></li>
</ol>
<ol class="extra straight-triangles">
   <li><div class="north"></div></li>
   <li><div class="east"></div></li>
   <li><div class="south"></div></li>
   <li><div class="west"></div></li>
</ol>
<p>Check out this other demo: <a href="https://codepen.io/ricardozea/pen/30a046dec7d990b1651931d0c1300f6b">CSS Shapes with Sass</a></p>
<hr>
<p>Created by <a href="http://ricardozea.design/" target="_blank" title="Link opens in a new tab">Ricardo Zea</a></p>
!

CSS 

              
                //Color variables (need to go at the on top):
$MyBlack: #272822;
$r: #c03;
$g: #429032;
$b: #2963bd;
$y: #c90;

//======

//Demo stuff - Edit below this line
div {
   margin-bottom: 20px;
   //Boxes or Triangle Combinations
   &.side1 {
      height: 0;
      width: 0;
      border-top: 100px solid $r;
      border-right: 100px solid $b;

      //Vertical
      &.vertical {
         transform: rotate(45deg);
         margin-top: 20px;
      }
   }

   &.side2 {
      height: 0;
      width: 0;
      border-bottom: 100px solid $g;
      border-right: 100px solid $y;
   }

   &.all4 {
      border-style: solid;
      border-width: 50px;
      border-bottom-color: $b;
      border-left-color: $g;
      border-top-color: $y;
      border-right-color: $r;
      height: 0;
      width: 0;
   }

   &.top-n-bottom {
      border-style: solid;
      border-width: 50px;
      border-bottom-color: $b;
      border-left-color: transparent;
      border-top-color: $y;
      border-right-color: transparent;
      height: 0;
      width: 0;
   }

   &.left-n-right {
      border-style: solid;
      border-width: 50px;
      border-bottom-color: transparent;
      border-left-color: $g;
      border-top-color: transparent;
      border-right-color: $r;
      height: 0;
      width: 0;
   }

   //Arrows - Diagonal
   &.top-right {
      height: 0;
      width: 0;
      border-top: 100px solid $g;
      border-left: 100px solid transparent;
   }

   &.bottom-right {
      height: 0;
      width: 0;
      border-bottom: 100px solid $r;
      border-left: 100px solid transparent;
   }

   &.bottom-left {
      height: 0;
      width: 0;
      border-bottom: 100px solid $b;
      border-right: 100px solid transparent;
   }

   &.top-left {
      height: 0;
      width: 0;
      border-top: 100px solid $y;
      border-right: 100px solid transparent;
   }

   //Arrows - Straight
   &.north {
      height: 0;
      width: 0;
      border-top: 100px solid $g;
      border-left: 100px solid transparent;
      transform: rotate(-45deg);
   }

   &.east {
      height: 0;
      width: 0;
      border-bottom: 100px solid $r;
      border-left: 100px solid transparent;
      transform: rotate(-45deg);

      //Only needed for demo
      margin-left: -50px;
   }

   &.south {
      height: 0;
      width: 0;
      border-bottom: 100px solid $b;
      border-right: 100px solid transparent;
      transform: rotate(-45deg);

      //Only needed for demo
      margin-top: -20px;
   }

   &.west {
      height: 0;
      width: 0;
      border-top: 100px solid $y;
      border-right: 100px solid transparent;
      transform: rotate(-45deg);
   }
}

//Top and Bottom separated
.top-bottom-separated {
   position: relative;
   margin-right: 170px;
   div {
      position: absolute;
      margin: 0;
   }
   .south {
      border-bottom: 100px solid $y;
      top: 40px;
   }

   //Only needed for demo
   .north {
      margin-top: 10px;
   }
}

//West and East separated
.west-east-separated {
   position: relative;
   div {
      position: absolute;
      margin: 0;
   }
   .east {
      border-bottom: 100px solid $r;
      top: 28px;
      left: 10px;
   }

   //Only needed for demo
   .west {
      margin-top: 10px;
   }
}

//Styling stuff not needed for demo

*, *::before, *::after { box-sizing: border-box; }
html { height: 100%; }
body {
   background-image: radial-gradient(lighten($MyBlack, 5), $MyBlack 150%);
   color: white;
   text-align: center;
   font-family: "Trebuchet MS";
}
h1 { font-weight: 100; }
a,
a:visited {
   color: $b;
   transition: .3s;
}
a:hover {
   color: $y;
   text-decoration: none;
}
ol {
   display: flex;
   flex-wrap: wrap;
   padding: 10px 10px 10px 35px;
   margin: 60px;
   list-style-type: lower-alpha;
   border: #333 1px solid;
   background: $MyBlack;
   border-radius: 2px;
   box-shadow: 0 0 5px rgba(black, 0.2);
   position: relative;
   &::before {
      display: inline-block;
      width: 100%;
      padding: 5px 10px;
      border-radius: 2px;
      content: "yes";
      position: absolute;
      top: -32px;
      left: 0;
      text-align: left;
      background: #111;
   }
   li {
      margin-right: 70px;
      &:last-of-type { margin: 0; }
   }
   &.extra { padding-top: 30px; }
}
.multiple-triangles::before { content: "Multiple Triangles:"; }
.diagonal-triangles::before { content: "Diagonal Triangles:"; }
.straight-triangles::before { content: "Straight Triangles:"; }

hr {
   width: 90%;
   margin: 30px auto;
   border: none;
   border-top: #666 1px dotted;
}

.pos-ab-element {
   width: 23px;
   height: 165px;
}
!

JS
!
999px

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