how to add a border to a square in css code example

Example 1: how do i make a boxin html

<div style="width:500px;height:100px;border:1px solid #000;">This is a rectangle!</div>

Example 2: html box

<!DOCTYPE html>
<html>
	<head>
		<title>Page Title</title>
	</head>
	<body>
	    <style>
	        .box {
	            height:5px;
	            width:5px;
	            background-color:blue;
                padding-top: 30px;
                padding-right: 30px;
                padding-bottom: 30px;
                padding-left: 30px;
                color:blue;
                border-width: 15px 15px 15px 15px;
                border-color: blue;
                border-style: solid;
                border-radius: 70%
                outline-color: blue;
                margin-top: 10px;
                margin-bottom: 10px;
                margin-right: 10px;
                margin-left: 10px;
            }
	    </style>
		<div class="box">
		    <h1 style="color:black;position:absolute;font-family:helvetical;font-size:20px;left:20px;bottom:325px;">Your Text</h1>
		</div>
	</body>
</html>

Example 3: curve bottom of square css

.round-bottom { 
  border-bottom-left-radius: 50% 150px !important;
  border-bottom-right-radius: 50% 150px !important;
  position: relative;
  overflow: hidden;
  width: 160%; 
  margin-bottom:-50px;
  left:-30%; 
  background-color:#444;
  background-image: url('https://upload.wikimedia.org/wikipedia/commons/a/a2/Tropical_Forest_with_Monkeys_A10893.jpg'); background-position: center center;
  background-size: 42% auto;
  height:150px;
}
.container { width: 100%; height: height:100px; padding-bottom:50px; overflow:hidden;}

<div class="container"><div class="round-bottom"></div></div>

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