*{
  box-sizing: border-box;
  padding:0px;
  margin:0px;
}
html{
  width:100%;
}
@media only screen and (min-width: 768px){ /*desktop */
  .column{
    vertical-align:top;
    display:inline-block;
    width:49.5%;
    background-color: yellow;
  }

}
@media only screen and (max-width: 768px){ /*mobile */
  .column{
    vertical-align:top;
    display:inline-block;
    width:100%;
    background-color: yellow;
  }

}

.slide{
  width:100%;
  padding: 10%;
  padding-top:5%;
}

body{
  background-color: yellow;
  width:95%;
  max-width:1500px;
  margin:auto;
}
#column1{
  padding-top:100px;
}