<h3>Saint Lucia</h3>

<div class="flag saint_lucia">
  <div class="saint_lucia__outer_triangle"></div>
</div>

* {
  box-sizing: border-box;
  margin: 0;
}

body {
  width: 100%;
  height: 100vh;
  background-color: rgb(221, 239, 255);
  display: grid;
  place-items: center;
  font-family: cursive;
  font-weight: bold;
}

h3 {
  position: absolute;
  text-align: center;
  top: 20px;
}

/* Main Style Stars from here  */
.flag {
  position: relative;
  width: 300px;
  height: 200px;
  box-shadow: 0 0 1px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.saint_lucia {
  background: #66ccff;
  display: grid;
  place-items: center;
}

.saint_lucia__outer_triangle {
  position: relative;
  width: 130px;
  height: 164px;
  background-color: white;
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

.saint_lucia__outer_triangle::before {
  content: "";
  position: absolute;
  width: 84%;
  height: 136px;
  margin: 20px 10px;
  background-color: black;
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

.saint_lucia__outer_triangle::after {
  content: "";
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 82px;
  background-color: #fcd116;
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}