CSSBattle 16.89: Summit Solution

Approach

Elements: circle (two), triangle

First I thought this would involve the use of mix-blend, but the final solution was to make use of overflow: hidden;

Result: 100% match

Implementation

1<div class="circle"></div>
2<div class="triangle"></div>
3<style>
4  body {
5    margin: 0;
6    background: #191919;
7  }
8  .circle {
9    background: #f9e492;
10    width: 200px;
11    height: 200px;
12    position: absolute;
13    top: 50%;
14    left: 50%;
15    transform: translate(-50%, -50%);
16    border-radius: 100%;
17  }
18  .triangle {
19    position: absolute;
20    top: 234px;
21    left: 50%;
22    transform: translate(-50%, -50%);
23    width: 300px;
24    height: 150px;
25    background: #4f77ff;
26    clip-path: polygon(50% 0, 0% 100%, 100% 100%);
27    overflow: hidden;
28  }
29  .triangle::after {
30    content: "";
31    background: #191919;
32    width: 200px;
33    height: 200px;
34    position: absolute;
35    left: 50%;
36    transform: translate(-50%, -109px);
37    border-radius: 100%;
38  }
39</style>

Other Battle #16 solutions

#89 - Summit

#90 - Eclipse

#91 - Reflection

#92 - Sequeeze

#93 - Great Wall

#94 - Ripples

#95 - Pokeball

#96 - Mandala

References

Original challenge