@charset   "UTF-8";

* {
  margin: 0;
  padding: 0 ;
  list-style: none;
  text-decoration: none;
}

#wrap {
  width: 100%;
  margin: 0 auto;
}
 
header {
  background: #333;
  color: #FFF;
  padding: 20px;
}

h1 {
  font-size: 2rem;
}

.main-menu {
  background: #333;
}
 
.main-menu ul li {
  text-align: center;
}
 
.main-menu ul li a {
  color: #FFF;
  display: block;
  padding: 10px 20px;
}
 
.main-menu ul li a:hover {
  background: #222;
}
 
section {
  background: #EEE;
  flex: 3;
  padding: 20px;
}
 
article {
  background: #FFF;
  padding: 20px;
  margin-bottom: 20px;  
}
 
aside {
  background: #DDD;
  flex: 1;
}
 
.sub-menu {
  background: #999; 
}
 
.sub-menu ul li {
  text-align: center;
}
 
.sub-menu ul li a {
  color: #FFF;
  display: block;
  padding: 10px 20px;
}
 
.sub-menu ul li a:hover {
  background: #666;
}
 
footer   {
  background: #333;
  color: #FFF;
  padding: 20px;
  text-align: center;
}

@media all and (min-width: 600px) {

  .main-menu ul {
    display: flex;
  }

  .main-menu ul li {
    text-align: left;
  }

  main {
    display: flex;
  }

  .sub-menu ul li {
    text-align: left;
  }

}

@media all and (min-width: 1025px) {

  #wrap {
    width: 84%;
    max-width: 1280px;
  }

  h1 {
    font-size: 4rem;
  }

}