.demo {
   background color:aqua;
   height:100%;
   width:100%;

}















* {
  box-sizing: border-box;
}

.row {
  content: "";
  clear: both;
 
}

.header {
  background-color:#621F1F;
  color:#9D8B72;
  padding: 15px;
  font-family:linkin.tff
}

.menu li {
  padding: 8px;
  margin-bottom: 7px;
  background-color: #614749;
  color: #621F1F;
}

.menu li:hover {
  background-color: #260D0F;
}

.aside {
  background-color: #827E73;
  padding: 15px;
  color: #827E73;
  text-align: center;
  font-size: 14px;
  
}

.footer {
  background-color: #9D9B72;
  color: #621F1F;
  text-align: center;
  font-size: 12px;
  padding: 15px;
}

/* For desktop: */
.col-1 {width: 8.33%;}
.col-2 {width: 16.66%;}
.col-3 {width: 25%;}
.col-4 {width: 33.33%;}
.col-5 {width: 41.66%;}
.col-6 {width: 50%;}
.col-7 {width: 58.33%;}
.col-8 {width: 66.66%;}
.col-9 {width: 75%;}
.col-10 {width: 83.33%;}
.col-11 {width: 91.66%;}
.col-12 {width: 100%;}

@media only screen and (max-width: 768px) {
  /* For mobile phones: */
  [class*="col-"] {
    width: 100%;
  }
}