.col-lg-6 {
 width: 50%;
 float: left;
 position: relative;
 min-height: 1px;
 padding-right: 15px;
 padding-left: 15px;
}
.big_title {
 text-align: center;
 color: #a4ddd8;
 margin-top: 120px;
 font-size:30px;
}
.back_home {
 text-align: center;
 margin-top: 100px;
}
@media only screen and (max-width: 768px){
.col-lg-6{width:100%;}
.col-lg-6 img {
 width: 100%;
}
.big_title {margin-top:40px;}
.back_home{margin-top:50px;}
}