bootstrap 4 video fulid and code example
Example: style youtube embed video css
//Add the following CSS to your code
.iframe-container{
position: relative;
width: 100%;
padding-bottom: 56.25%;
height: 0;
}
.iframe-container iframe{
position: absolute;
top:0;
left: 0;
width: 100%;
height: 100%;
}