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About the <head>

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CSS

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CSS Base

About CSS Base

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Vendor Prefixing

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HTML 

              
                <div class="main">
  <header>
    <p>
      An Animated Scroll To Top Button With jQuery
    </p>
    <p>
      by
    </p>
    <p>
      <i>Mostafa Mohamed</i>
    </p>
  </header>
  <div class="left">
    <ul>
      <li>
        <a class="link1" href="">Link 1</a>
      </li>
      <li>
        <a class="link2" href="">Link 2</a>
      </li>
      <li>
        <a class="link3" href="">Link 3</a>
      </li>
    </ul>
  </div>
  <div class="right">
    <h2 id="h1">
					HEADING 1
				</h2>
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce pellentesque velit nec blandit pharetra. Donec ornare, massa non congue fermentum, tellus turpis congue nisi, non pharetra nisi orci vel nisi. Nam sed vestibulum augue. Morbi vestibulum, ante
      sed interdum ultricies, risus nibh consequat tortor, non cursus ante justo in turpis. Sed nec diam ultrices, venenatis tortor at, eleifend tellus. Donec id ornare tortor. Cras rutrum vel tortor suscipit fermentum. Sed molestie neque ultrices, consequat
      risus id, suscipit enim. Duis arcu nibh, interdum nec est ut, gravida molestie urna. Integer quam ante, aliquet a pretium vitae, tempor vitae diam. Maecenas eros risus, fermentum vitae congue interdum, pulvinar non leo. Suspendisse sit amet dignissim
      massa, ac ullamcorper urna. In hac habitasse platea dictumst. Cras tincidunt orci lorem, eget placerat dui consectetur vel. Donec convallis in dolor quis laoreet. Nunc quis fringilla tellus. Interdum et malesuada fames ac ante ipsum primis in faucibus.
      Nullam congue felis ut lectus porttitor faucibus. Curabitur vitae lorem vestibulum, blandit dui at, luctus justo. Morbi lectus eros, faucibus luctus feugiat commodo, lobortis sed nulla. Fusce et fermentum ante. Vivamus consequat varius sem, eget
      hendrerit lectus tempus ac. In hac habitasse platea dictumst. Cras imperdiet elit id auctor tincidunt. Morbi eu leo eros. Etiam ultricies ornare adipiscing. Mauris interdum eleifend congue. Curabitur eu ante sed turpis fermentum iaculis sed vitae
      nibh. Duis sapien tellus, laoreet at dignissim non, congue id nisi. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce pellentesque velit nec blandit pharetra. Donec ornare, massa non congue fermentum, tellus turpis congue nisi, non
      pharetra nisi orci vel nisi. Nam sed vestibulum augue. Morbi vestibulum, ante sed interdum ultricies, risus nibh consequat tortor, non cursus ante justo in turpis. Sed nec diam ultrices, venenatis tortor at, eleifend tellus. Donec id ornare tortor.
      Cras rutrum vel tortor suscipit fermentum. Sed molestie neque ultrices, consequat risus id, suscipit enim. Duis arcu nibh, interdum nec est ut, gravida molestie urna. Integer quam ante, aliquet a pretium vitae, tempor vitae diam. Maecenas eros risus,
      fermentum vitae congue interdum, pulvinar non leo. Suspendisse sit amet dignissim massa, ac ullamcorper urna. In hac habitasse platea dictumst. Cras tincidunt orci lorem, eget placerat dui consectetur vel. Donec convallis in dolor quis laoreet.
      Nunc quis fringilla tellus. Interdum et malesuada fames ac ante ipsum primis in faucibus. Nullam congue felis ut lectus porttitor faucibus. Curabitur vitae lorem vestibulum, blandit dui at, luctus justo. Morbi lectus eros, faucibus luctus feugiat
      commodo, lobortis sed nulla. Fusce et fermentum ante. Vivamus consequat varius sem, eget hendrerit lectus tempus ac. In hac habitasse platea dictumst. Cras imperdiet elit id auctor tincidunt. Morbi eu leo eros. Etiam ultricies ornare adipiscing.
      Mauris interdum eleifend congue. Curabitur eu ante sed turpis fermentum iaculis sed vitae nibh. Duis sapien tellus, laoreet at dignissim non, congue id nisi.
    </p>
    <h2 id="h2">
					HEADING 2
				</h2>
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce pellentesque velit nec blandit pharetra. Donec ornare, massa non congue fermentum, tellus turpis congue nisi, non pharetra nisi orci vel nisi. Nam sed vestibulum augue. Morbi vestibulum, ante
      sed interdum ultricies, risus nibh consequat tortor, non cursus ante justo in turpis. Sed nec diam ultrices, venenatis tortor at, eleifend tellus. Donec id ornare tortor. Cras rutrum vel tortor suscipit fermentum. Sed molestie neque ultrices, consequat
      risus id, suscipit enim. Duis arcu nibh, interdum nec est ut, gravida molestie urna. Integer quam ante, aliquet a pretium vitae, tempor vitae diam. Maecenas eros risus, fermentum vitae congue interdum, pulvinar non leo. Suspendisse sit amet dignissim
      massa, ac ullamcorper urna. In hac habitasse platea dictumst. Cras tincidunt orci lorem, eget placerat dui consectetur vel. Donec convallis in dolor quis laoreet. Nunc quis fringilla tellus. Interdum et malesuada fames ac ante ipsum primis in faucibus.
      Nullam congue felis ut lectus porttitor faucibus. Curabitur vitae lorem vestibulum, blandit dui at, luctus justo. Morbi lectus eros, faucibus luctus feugiat commodo, lobortis sed nulla. Fusce et fermentum ante. Vivamus consequat varius sem, eget
      hendrerit lectus tempus ac. In hac habitasse platea dictumst. Cras imperdiet elit id auctor tincidunt. Morbi eu leo eros. Etiam ultricies ornare adipiscing. Mauris interdum eleifend congue. Curabitur eu ante sed turpis fermentum iaculis sed vitae
      nibh. Duis sapien tellus, laoreet at dignissim non, congue id nisi. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce pellentesque velit nec blandit pharetra. Donec ornare, massa non congue fermentum, tellus turpis congue nisi, non
      pharetra nisi orci vel nisi. Nam sed vestibulum augue. Morbi vestibulum, ante sed interdum ultricies, risus nibh consequat tortor, non cursus ante justo in turpis. Sed nec diam ultrices, venenatis tortor at, eleifend tellus. Donec id ornare tortor.
      Cras rutrum vel tortor suscipit fermentum. Sed molestie neque ultrices, consequat risus id, suscipit enim. Duis arcu nibh, interdum nec est ut, gravida molestie urna. Integer quam ante, aliquet a pretium vitae, tempor vitae diam. Maecenas eros risus,
      fermentum vitae congue interdum, pulvinar non leo. Suspendisse sit amet dignissim massa, ac ullamcorper urna. In hac habitasse platea dictumst. Cras tincidunt orci lorem, eget placerat dui consectetur vel. Donec convallis in dolor quis laoreet.
      Nunc quis fringilla tellus. Interdum et malesuada fames ac ante ipsum primis in faucibus. Nullam congue felis ut lectus porttitor faucibus. Curabitur vitae lorem vestibulum, blandit dui at, luctus justo. Morbi lectus eros, faucibus luctus feugiat
      commodo, lobortis sed nulla. Fusce et fermentum ante. Vivamus consequat varius sem, eget hendrerit lectus tempus ac. In hac habitasse platea dictumst. Cras imperdiet elit id auctor tincidunt. Morbi eu leo eros. Etiam ultricies ornare adipiscing.
      Mauris interdum eleifend congue. Curabitur eu ante sed turpis fermentum iaculis sed vitae nibh. Duis sapien tellus, laoreet at dignissim non, congue id nisi.
    </p>
    <h2 id="h3">
					HEADING 3
				</h2>
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce pellentesque velit nec blandit pharetra. Donec ornare, massa non congue fermentum, tellus turpis congue nisi, non pharetra nisi orci vel nisi. Nam sed vestibulum augue. Morbi vestibulum, ante
      sed interdum ultricies, risus nibh consequat tortor, non cursus ante justo in turpis. Sed nec diam ultrices, venenatis tortor at, eleifend tellus. Donec id ornare tortor. Cras rutrum vel tortor suscipit fermentum. Sed molestie neque ultrices, consequat
      risus id, suscipit enim. Duis arcu nibh, interdum nec est ut, gravida molestie urna. Integer quam ante, aliquet a pretium vitae, tempor vitae diam. Maecenas eros risus, fermentum vitae congue interdum, pulvinar non leo. Suspendisse sit amet dignissim
      massa, ac ullamcorper urna. In hac habitasse platea dictumst. Cras tincidunt orci lorem, eget placerat dui consectetur vel. Donec convallis in dolor quis laoreet. Nunc quis fringilla tellus. Interdum et malesuada fames ac ante ipsum primis in faucibus.
      Nullam congue felis ut lectus porttitor faucibus. Curabitur vitae lorem vestibulum, blandit dui at, luctus justo. Morbi lectus eros, faucibus luctus feugiat commodo, lobortis sed nulla. Fusce et fermentum ante. Vivamus consequat varius sem, eget
      hendrerit lectus tempus ac. In hac habitasse platea dictumst. Cras imperdiet elit id auctor tincidunt. Morbi eu leo eros. Etiam ultricies ornare adipiscing. Mauris interdum eleifend congue. Curabitur eu ante sed turpis fermentum iaculis sed vitae
      nibh. Duis sapien tellus, laoreet at dignissim non, congue id nisi. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce pellentesque velit nec blandit pharetra. Donec ornare, massa non congue fermentum, tellus turpis congue nisi, non
      pharetra nisi orci vel nisi. Nam sed vestibulum augue. Morbi vestibulum, ante sed interdum ultricies, risus nibh consequat tortor, non cursus ante justo in turpis. Sed nec diam ultrices, venenatis tortor at, eleifend tellus. Donec id ornare tortor.
      Cras rutrum vel tortor suscipit fermentum. Sed molestie neque ultrices, consequat risus id, suscipit enim. Duis arcu nibh, interdum nec est ut, gravida molestie urna. Integer quam ante, aliquet a pretium vitae, tempor vitae diam. Maecenas eros risus,
      fermentum vitae congue interdum, pulvinar non leo. Suspendisse sit amet dignissim massa, ac ullamcorper urna. In hac habitasse platea dictumst. Cras tincidunt orci lorem, eget placerat dui consectetur vel. Donec convallis in dolor quis laoreet.
      Nunc quis fringilla tellus. Interdum et malesuada fames ac ante ipsum primis in faucibus. Nullam congue felis ut lectus porttitor faucibus. Curabitur vitae lorem vestibulum, blandit dui at, luctus justo. Morbi lectus eros, faucibus luctus feugiat
      commodo, lobortis sed nulla. Fusce et fermentum ante. Vivamus consequat varius sem, eget hendrerit lectus tempus ac. In hac habitasse platea dictumst. Cras imperdiet elit id auctor tincidunt. Morbi eu leo eros. Etiam ultricies ornare adipiscing.
      Mauris interdum eleifend congue. Curabitur eu ante sed turpis fermentum iaculis sed vitae nibh. Duis sapien tellus, laoreet at dignissim non, congue id nisi.
    </p>
  </div>
  <footer></footer>
  <div id="stop" class="scrollTop">
    <span><a href="">Top</a></span>
  </div>
</div>
<!-- main-->
!

CSS 

              
                *:before,
*:after {
  box-sizing: border-box;
}

body {
  background-color: #3e3e3e;
  color: #444;
  font-family: arial;
}

header {
  text-align: center;
  font-size: 25px;
  text-transform: uppercase;
  background-color: #F2F2F2;
  padding: 20px;
}

header p {
  margin: 0px;
}

header p:last-child {
  color: #BE3F48;
}

.main {
  width: 760px;
  margin: 0 auto;
  background-color: #fff;
  position: relative!important;
  padding: 20px;
}

.left,
.right {
  float: left;
  display: block;
}

.left {
  width: 200px;
  padding: 10px;
}

.left ul {
  position: fixed;
  display: block;
  background-color: #F2F2F2;
  padding: 0px;
}

.left ul li {
  list-style: none;
  line-height: 30px;
}

.left ul li a {
  color: #000000;
  display: block;
  padding: 5px;
  text-align: center;
  text-decoration: none;
  width: 190px;
}

.left ul li a:hover {
  background-color: #E4E4E4;
}

.right {
  width: 520px;
  padding: 10px;
}

.right > p {
  margin-bottom: 40px;
}

#h1 {
  background-color: #497493;
  color: #fff;
  padding: 5px 10px;
}

#h2 {
  background-color: #B84A4A;
  color: #fff;
  padding: 5px 10px;
}

#h3 {
  background-color: #538253;
  color: #fff;
  padding: 5px 10px;
}

footer {
  clear: both;
}


/****************************************
  IMPORTANT 
*****************************************/

.scrollTop {
  position: fixed;
  right: 10%;
  bottom: 10px;
  background-color: #BE3F48;
  padding: 20px;
  opacity: 0;
  transition: all 0.4s ease-in-out 0s;
}

.scrollTop a {
  font-size: 18px;
  color: #fff;
}
!

JS 

              
                // BY KAREN GRIGORYAN

$(document).ready(function() {
  /******************************
      BOTTOM SCROLL TOP BUTTON
   ******************************/

  // declare variable
  var scrollTop = $(".scrollTop");

  $(window).scroll(function() {
    // declare variable
    var topPos = $(this).scrollTop();

    // if user scrolls down - show scroll to top button
    if (topPos > 100) {
      $(scrollTop).css("opacity", "1");

    } else {
      $(scrollTop).css("opacity", "0");
    }

  }); // scroll END

  //Click event to scroll to top
  $(scrollTop).click(function() {
    $('html, body').animate({
      scrollTop: 0
    }, 800);
    return false;

  }); // click() scroll top EMD

  /*************************************
    LEFT MENU SMOOTH SCROLL ANIMATION
   *************************************/
  // declare variable
  var h1 = $("#h1").position();
  var h2 = $("#h2").position();
  var h3 = $("#h3").position();

  $('.link1').click(function() {
    $('html, body').animate({
      scrollTop: h1.top
    }, 500);
    return false;

  }); // left menu link2 click() scroll END

  $('.link2').click(function() {
    $('html, body').animate({
      scrollTop: h2.top
    }, 500);
    return false;

  }); // left menu link2 click() scroll END

  $('.link3').click(function() {
    $('html, body').animate({
      scrollTop: h3.top
    }, 500);
    return false;

  }); // left menu link3 click() scroll END

}); // ready() END
!
999px

Console