CSS

button position translate on bottom edge bootstrap

#parent{
	    height: 200px;
	    width: 100%;
	    position: relative;
	    border: 1px solid blue;

 }
#parent #child{
        width:100%; 
        margin: auto;
        text-align: center;
        bottom: 0px;
        position: absolute;
        translatex: -50%;
}