Check out example codes for "float css w3schools". It will help you in understanding the concepts better.

Code Example 1

.col-1 {width: 8.33%;}
.col-2 {width: 16.66%;}
.col-3 {width: 25%;}

.col-4 {width: 33.33%;}
.col-5 {width: 41.66%;}
.col-6 {width: 50%;}

.col-7 {width: 58.33%;}
.col-8 {width: 66.66%;}
.col-9 {width: 75%;}

.col-10 {width: 83.33%;}
.col-11 {width: 91.66%;}
.col-12 {width: 
100%;}

Code Example 2

#main {  width:50px;  height: 150px;  border:1px solid black;  display: flex;     flex-flow: row nowrap;}

Code Example 3

.myelement {
	float: left;
}

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