css

html, body
{
  margin: 0;
  padding: 0;
  height: 100%;
  text-align: center;
}
section
{
  min-height: 100%;
}
a
{
  text-decoration: none;
}
li
{
  list-style-type: none;
}
h1, h2, h3, a
{
  font-family: 'Roboto', sans-serif;
  font-weight: 500;
  color: #494949;
  text-transform: uppercase;
}
h2
{
  color: #5D7177;
}
h3
{
  font-size: 40px;
  padding-top: 8%;
  margin: 0;
  margin-bottom: 5px;
}
h4, p
{
  font-family: 'Roboto Slab', serif;
  color: #494949;
}
hr
{
  width: 30px;
  height: 3px;
  background: #494949;
  border: 0;
  margin: 0 auto 40px auto;
}
#logo, li, img, .button, .fa-bars
{
  transition: all 300ms;
  -webkit-transition: all 300ms;
  -moz-transition: all 300ms;
  -o-transition: all 300ms;
}
.fa-bars
{
  display: none;
}

/* HEADER */

header
{
  width: 98%;
  height: 65px;
  position: fixed;
  top: 1%;
  left: 1%;
  right: 1%;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .1);
  z-index: 1;
}
#logo
{
  width: 140px;
  float: left;
  margin: 10px 0 0 50px;
}
#logo:hover
{
  opacity: 0.5;
}
#logo img
{
  width: 100%;
}
header nav
{
  float: right;
  margin: 10px 50px 0 0;
}
header nav ul li
{
  float: left;
  margin-left: 25px;
}
header nav ul li a
{
  font-size: 16px;
}
header nav ul li:hover
{
  padding-top: 5px;
}

/* HOME */

#home
{
  background: url(../img/fensterrahmen1.jpg);
  background-position: center center;
  background-size: cover;
  background-attachment: fixed;
}
#home h1
{
  margin: 240px auto 0 auto;
  font-size: 110px;
}
#home h2
{
  margin: 0 auto 0 auto;
  font-size: 25px;
}
#home img
{
  width: 32px;
  margin-top: 150px;
  opacity: 0.7;
}
#home img:hover
{
  opacity: 1;
}

/* ABOUT */

#about img
{
  width: 240px;
}
#about img:hover
{
  transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -moz-transform: scale(1.1);
  -o-transform: scale(1.1);
}
#about h4
{
  font-size: 25px;
}
#about p
{
  width: 700px;
  margin: 0 auto 0 auto;
}

/* WORK */

#work
{
  background-color: #f0f0f0;
}
#projects
{
  width: 900px;
  margin: 0 auto 0 auto;
}
#projects ul
{
  padding: 0;
}
#projects ul li
{
  width: 33.3%;
  float: left;
  margin-bottom: 15px;
}
#projects img
{
  width: 280px;
  height: 170px;
  border-radius: 5px;
}
#projects img:hover
{
  transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -moz-transform: scale(1.1);
  -o-transform: scale(1.1);
  box-shadow: 0 5px 5px rgba(0, 0, 0, .3);
}

/* CONTACT */

form input, textarea
{
  font-family: 'Roboto Slab', serif;
  font-size: 15px;
  margin-bottom: 10px;
  border-radius: 2px;
  border: 2px solid #494949;
  outline: none;
}
form input:first-child
{
  margin-top: 10px;
}
form input
{
  width: 552px;
  height: 30px;
}
form textarea
{
  width: 552px;
  height: 200px;
  resize: none;
}
.input_text
{
  color: #494949;
  padding-left: 10px;
}
::-webkit-input-placeholder
{
  color: #999999;
}
::-moz-placeholder
{
  color: #999999;
}
:-ms-input-placeholder
{
  color: #999999;
}
:-moz-placeholder
{
  color: #999999;
}
.button
{
  background-color: #f0f0f0;
  color: #494949;
  width: 566px;
  height: 50px;
}
.button:hover
{
  background-color: #494949;
  color: #f0f0f0;
}

/* FOOTER */

footer
{
  width: 100%;
  height: 70px;
  background-color: #3f3f3f;
}
footer p
{
  font-size: 12px;
  color: #f0f0f0;
  padding-top: 30px;
}

/* MEDIA QUERIES */

/* TABLETS */

@media screen and (max-width: 1024px)
{
  header
  {
    height: auto;
  }
  #logo
  {
    width: 100px;
    margin-top: 5px;
  }
  header nav
  {
    margin-top: 0;
  }
  header nav ul li
  {
    font-size: 12px;
  }
  #home h1
  {
    font-size: 90px;
    margin-top: 200px;
  }
  #home h2
  {
    font-size: 22px;
  }
  h3
  {
    padding-top: 12%;
  }
  #about p
  {
    width: 80%;
  }
  #projects
  {
    width: auto;
  }
  #projects ul li
  {
    width: 100%;
    float: none;
  }
  #projects ul li:last-child
  {
    padding-bottom: 20%;
  }
  #projects img
  {
    width: 55%;
    height: auto;
  }
  form input, form textarea
  {
    width: 60%;
  }
  .button
  {
    width: 62%;
  }
}

 /* MOBILES */

@media screen and (max-width: 640px)
{
  #logo
  {
    width: 90px;
    margin-left: 30px;
  }
  header
  {
    height: 50px;
  }
  header nav
  {
    margin: 0;
    float: none;
  }
  .fa-bars
  {
    font-size: 17px;
    display: inline-block;
    width: 100%;
    cursor: pointer;
    text-align: right;
    float: right;
    margin: -25px 30px 0 0;
  }
  .fa-bars:hover
  {
    opacity: 0.5;
  }
  header nav ul
  {
    height: 0;
    overflow: hidden;
    margin: 0;
    padding: 0;
    width: 100%;
  }
  header nav ul.open
  {
    height: auto;
  }
  header nav ul li
  {
    width: 100%;
    padding: 5px 0;
    margin: 0;
    font-size: 11px;
    border-top: 1px solid #dddddd;
    background-color: #fff;
  }
  header nav ul li:hover
  {
    background-color: #eeeeee;
  }
  #home h1
  {
    font-size: 60px;
    margin-top: 100px;
  }
  #projects img
  {
    width: 70%;
    height: auto;
  }
  form input, form textarea
  {
    width: 70%;
  }
  .button
  {
    width: 72%;
  }
}