Minimal grid system with media query

by makzan

HTML

<header class='row'>
    <div class='four col'>
      <h1><img src='http://placehold.it/50x50' />Big Title Here</h1>
    </div>
</header>       
<div class='row'>
    <nav class='four col'>
        <ul>
          <li><a href='#'>Link Here</a></li>
          <li><a href='#'>Link Here</a></li>
          <li><a href='#'>Link Here</a></li>
          <li><a href='#'>Link Here</a></li>
          <li><a href='#'>Link Here</a></li>
          <li><a href='#'>Link Here</a></li>
        </ul>
    </nav>
</div>
<div class='row'>
    <div class='three col'>
      <p>3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text 3 col text </p>
      <div class='row'>
        <div class='one col'>Login</div>
        <div class='three col'>
          <input type='text'>
          <input type='text'></input>
          <input type='submit' value='Login'>
        </div>
      </div>
    </div>
    <div class='one col'>
      <p>1 col</p>
      <p>1 col</p>
      <p>1 col</p>
      <p>1 col</p>
    </div>
</div>

<footer class='row'>
    <div class='four col'>
        footer here
    </div>
</footer>

CSS

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  box-sizing: border-box;
}

html, body {
  font-size: 14px;
}

p {
  text-align: justify;
}

input[type="text"] {
  width: 100%;
}

.row {
  width: 500px;
  max-width: 100%;
  border: 1px solid blue;
  margin: 0 auto;
  overflow: auto;
}

.row .row {
  width: 100%;
  margin-left: -10px;
}

.col {
  padding: 0 10px;
  border: 1px solid red;
  float:left;
}
.one {
  width: 25%;
}
.two {
  width: 50%;
}
.three {
  width: 75%;
}
.four {
  width: 100%;
}

header h1 {
  margin: 0;
  padding: 0;
  font-size: 2em;
}

header h1 img {
  vertical-align: middle;
  margin-right: 5px;
}

nav ul {
  list-style: none;
  padding: 0;
}

nav ul li {
  float: left;
  border: 1px solid green;
}

nav ul li a {
  text-decoration: none;
  color: blue;
  padding: 2px;
  display: inline-block;
}


@media all and (max-width: 380px) {
  .col {
    width: 100%;
  }
  
  .row .row {
    margin: auto;
  }
  
  .row .row .col {
    padding: 0;
  }
  
  input {
    width: 100%;
  }
  
  
  header h1 {
    text-align: center;
    font-size: 1em;
  }
  header h1 img {
    display: block;
    margin: 0 auto;
  }
  
  nav ul li{
    width: 50%;
  }
}