Untitled

<!DOCTYPE html>
<html>
<head>
<style>
.container {
  width: 200px;
  height: 50px;
  position: relative;
  background: #ddd;
  border-radius: 25px;
  overflow: hidden;
  box-sizing: border-box;
}

.button {
  width: 50%;
  height: 100%;
  position: relative;
  float: left;
  line-height: 50px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

.button:hover {
  background: #bbb;
}

#button1 {
  background: #f00;
}

#button2 {
  background: #0f0;
}
</style>
</head>
<body>

<div class="container">
  <div class="button" id="button1">Button 1</div>
  <div class="button" id="button2">Button 2</div>
</div>

</body>
</html>
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