.my-gallery {
  margin: 20px 0 40px 0;  
  width: 100%;
  float: left;
}
.my-gallery img {
  width: 640px;
  height: auto;
}
.my-gallery titel {
  display: none;
  font-size: 33px;
}
@media(max-width:4199px){
.my-gallery img {width: 580px; height: auto; margin-bottom: 8px;}
}
@media(max-width:3599px){
.my-gallery img {width: 480px; height: auto; margin-bottom: 7px;}
}
@media(max-width:2999px){
.my-gallery img {width: 380px; height: auto; margin-bottom: 6px;}
}
@media(max-width:2399px){
.my-gallery img {width: 280px; height: auto; margin-bottom: 5px;}
}
@media(max-width:1799px){
.my-gallery img {width: 240px; height: auto; margin-bottom: 4px;}
}
@media(max-width:1399px){
.my-gallery img {width: 220px; height: auto; margin-bottom: 4px;}
}
@media(max-width:999px){
.my-gallery img {width: 170px; height: auto;}
}
@media(max-width:749px){
.my-gallery img {width: 150px; height: auto;}
}