<h3>Botswana</h3>
<div class="container" data-name="#23 - Botswana">
  <div class="flag botswana"></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;
}

.botswana {
  background-color: #6dabd2;
  display: grid;
  place-items: center;
}

.botswana::before {
  position: absolute;
  content: "";
  width: 100%;
  height: 40px;
  background-color: black;
  border-width: 10px 0 10px 0;
  border-color: white;
  border-style: solid;
}