The PHP elseif statement with select dropdown, div, and CSS

PHP Code
Output
<html>
<head>
</head>
<body>
<p>
<select onChange="window.location='test.php?color='+this.value">
<option>Select a Color</option>
<option value="red">Red</option>
<option value="orange">Orange</option>
<option value="yellow">Yellow</option>
<option value="green">Green</option>
<option value="maroon">Maroon</option>
<option value="blue">Bluish</option>
<option value="pink">Pink</option>
</select>
</p>


</body>
</html>

//Correct the spacing of PHP opening and closing tags

<  ?php
$Color = $_REQUEST["color"]; 
if ($Color == "red"){
  echo "<div style='width:40%;height:300px;background-color:red;'></div>";  
}
elseif ($Color == "orange"){
  echo "<div style='width:40%;height:300px;background-color:orange;'></div>";  
}
elseif ($Color == "yellow"){
  echo "<div style='width:40%;height:300px;background-color:yellow;'></div>";    
}
elseif ($Color == "green"){
  echo "<div style='width:40%;height:300px;background-color:green;'></div>";    
}
elseif ($Color == "maroon"){
  echo "<div style='width:40%;height:300px;background-color:maroon;'></div>";    
}
elseif ($Color == "blue"){
  echo "<div style='width:40%;height:300px;background-color:blue;'></div>";    
}
elseif ($Color == "pink"){
 echo "<div style='width:40%;height:300px;background-color:pink;'></div>";     
}    
else{
 echo ("Select a Color from dropdown");
}
? >
Select a Color from dropdown