* {
  box-sizing: border-box;
}

.row::after {
  content: "";
  clear: both;
  display: table;
}

[class*="col-"] {
  float: left;
  padding: 15px;
}


.header {
background-image: linear-gradient(red, yellow);
color: #ffffff;
padding: 10px;
}
 ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

 li {
  padding: 12px;
  margin-bottom: 15px;
  background-color: Black;
  color: White;
}
 li:hover {
  background-color: #28470f;
}
li:Active {
  background-color: #28470f;
  transform: translateY(4px);}
  
.aside {
background: rgba(210,255,82,1);
  padding: 15px;
  color: Black;
  text-align: center;
  font-size: 15px;
 border: 1px solid;
  padding: 10px;
  box-shadow: 5px 10px #888888;
  border-radius: 50px;  }
  iframe { border-radius: 50px;}

.footer {
  background-image: linear-gradient(red, yellow);
  color: #ffffff;
  text-align: center;
  font-size: 12px;
  padding: 15px;
  width:100%; 
}

body {
  background-color: lightblue;
}

@media screen and (min-width: 400px) {
  body {
    background-color: lightblue;
  }
}

@media screen and (min-width: 800px) {
  body {
    background-color: lavender;
  }
}


/* Movils */
[class*="col-"] {
  width: 100%;
}

@media only screen and (min-width: 500px) {
  /* Tablets: */
  .col-s-1 {width: 8.33%;}
  .col-s-2 {width: 16.66%;}
  .col-s-3 {width: 25%;}
  .col-s-4 {width: 33.33%;}
  .col-s-5 {width: 41.66%;}
  .col-s-6 {width: 50%;}
  .col-s-7 {width: 58.33%;}
  .col-s-8 {width: 66.66%;}
  .col-s-9 {width: 75%;}
  .col-s-10 {width: 83.33%;}
  .col-s-11 {width: 91.66%;}
  .col-s-12 {width: 100%;}
}
@media only screen and (min-width: 700px) {
  /* Ordinadors */
  .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%;}
}