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not_null.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title> Not Null Constraint </title>
<style type="text/css">
body
{
/*background-image: linear-gradient(35deg,lightblue,brown);*/
background: #7F7FD5;
background: -webkit-linear-gradient(to left, #91EAE4, #86A8E7, #7F7FD5);
background: linear-gradient(to left, #91EAE4, #86A8E7, #7F7FD5);
}
::-webkit-scrollbar
{
width: 0px;
}
nav
{
font-size: 50px;
letter-spacing: 2px;
text-align: center;
font-family: 'Calistoga', cursive;
font-style: italic;
color: lightgreen;
-webkit-animation: tracking-in-contract 1.5s cubic-bezier(0.215, 0.610, 0.355, 1.000) both;
animation: tracking-in-contract 1.5s cubic-bezier(0.215, 0.610, 0.355, 1.000) both;
animation-duration: 5s;
}
@keyframes tracking-in-contract
{
0%
{
letter-spacing: 1em;
opacity: 0;
}
40%
{
opacity: 0.6;
}
100%
{
letter-spacing: normal;
opacity: 1;
}
}
.flexbox
{
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
}
.image
{
margin: 50px;
height: 350px;
width: 610px;
border-radius: 50px;
}
.image:hover
{
box-shadow: -20px 20px 60px white, 20px -20px 60px white;
}
</style>
</head>
<body>
<nav> Not Null Constraint </nav>
<div class="flexbox">
<img src="https://mjnvsai.github.io/Database-Management/Media/pic31.PNG" class="image">
</div>
</body>
</html>