relative.css

@media only screen and (max-width: 768px) {

  /*
.sample_text, .sample_text-one, .none-text {
  display: none; 
}
*/
.none_text {
    display: inline; 
  }

  footer {
    position: absolute;
    left: 0;
    bottom: auto;
    width: 100%;
    background-color: rgb(25, 187, 173);
    color: white;
 }

  iframe {
  position: relative;
  height: 200px;
  width: 350px;
  margin-left: -2px;
  top: 45%;
  z-index: 10;
}
  
pre {
    margin-left: -8;
    font-size: 10px;
    border: 2px solid grey;
    max-width: 180%;
    width: 318px;
    border-left: 12px solid rgb(25, 187, 173);
    border-radius: 5px;
    padding: 14px;
    text-align: left;
    background-color: black;
    color: white;
    font-family: Consolas, "Andale Mono WT", "Andale Mono", "Lucida Console", 
"Lucida Sans Typewriter", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", 
"Liberation Mono", "Nimbus Mono L", Monaco, "Courier New", Courier, monospace;
    word-wrap:break-word;
  }

  .ikon_right {
    position: relative;
    right: 20px;
  }

  .themes_img {
    width: 250px;
    height: 120px;
  }
  
}