flex box grids code example

Example 1: flexbox grid

.container {
    max-width: 1335px;
    margin: 0 auto;
}
.grid-row {
    display: flex;
    flex-flow: row wrap;
    justify-content: flex-start;
}
.grid-item {
    height: 550px; /*optional*/
    flex-basis: 20%; /* initial percantage */
    -ms-flex: auto;
    width: 259px; /*optional*/
    position: relative;
    padding: 10px; /*optional*/
    box-sizing: border-box;
}
@media(max-width: 1333px) {/*xl*/
	.grid-item {
    	flex-basis: 33.33%;
    }
}
@media(max-width: 1073px) {/*lg*/
    .grid-item {
    	flex-basis: 33.33%;
    }
}
@media(max-width: 815px) {/*md*/
	.grid-item {
    	flex-basis: 50%;
    }
}
@media(max-width: 555px) {/*sm*/
	.grid-item {
    	flex-basis: 100%;
    }
}

Example 2: flex box in css

<!--basic--flex--layout-->
<html>
	<head>
		<style>
			.parent{
              display:  flex or inline-flex;
              flex-direction: row  or column;
              flex-wrap: wrap or wrap-reverse;
 			}
		</style>
	</head>
	<body>
		<div class="parent">
			<div class="child-1"></div>
			.
			.
			.
		</div>
	</body>
</html>

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Html Example