JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="container">
        <div class="box">
            <div class="triSectionTop"></div>
            <div class="triSectionRight"></div>
            <div class="triSectionBottom"></div>
            <div class="triSectionLeft"></div>
        </div>
    </div>
</body>

SCSS

.container {
    box-sizing: border-box;
    height: 400px;
    width: 400px;
}
.box {    
  position: relative;
  box-sizing: border-box;
  height: 400px;
  width: 100%;
}
.triSectionTop {
    position: absolute;
    top: 0;
    width: 100%;
    height: 0;
    padding-left: 50%;
    padding-top: 50%;
    overflow: hidden;

    &:after {
        content: "";
        display: block;
        width: 0;
        height: 0;
        margin-left: -200px;
        margin-top: -200px;
        border-left: 200px solid transparent;
        border-right: 200px solid transparent;
        border-top: 200px solid #41a5e8;
    }
}
.triSectionRight {
    position: absolute;
    right: 0;
    width: 50%;
    height: 0;
    padding-top: 50%;
    padding-bottom: 50%;
    overflow: hidden;
    
    &:after {
        content: "";
        display: block;
        width: 0;
        height: 0;
        margin-top: -200px;
        
        border-top: 200px solid transparent;
        border-bottom: 200px solid transparent;
        border-right: 200px solid #4eb2f5;
    }
}
.triSectionBottom {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 0;
    padding-left: 50%;
    padding-bottom: 50%;
    overflow: hidden;
    
    &:after {
        content: "";
        display: block;
        width: 0;
        height: 0;
        margin-left: -200px;
        
        border-left: 200px solid transparent;
        border-right: 200px solid transparent;
        border-bottom: 200px solid #5abeff;
    }
}
.triSectionLeft {
    position: absolute;
    left: 0;
    width: 0;
    height: 0;
    padding-top: 50%;
    padding-bottom: 50%;
    padding-left: 50%;
    overflow: hidden;
    
    &:after {
        content: "";
        display: block;
        width: 0;
        height: 0;
        margin-top: -200px;
        margin-left: -200px;
        
        border-top: 200px solid transparent;
        border-bottom: 200px solid transparent;
        border-left: 200px solid #67cbff;
    }
}