<style>
.black {
  background-color: black;
width: 100%;margin:0px;
}
.white {
  background-color: white;width: 100%;margin:0px;
}
.content {
  background-color: white;width: 100%; margin:0px;
}
.imagecenter {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
html, body {width: 100%;  background-color: black;
    height: 100%;
}
html {
    display: table;
    margin: auto;
}

body {
    display: table-cell;
    vertical-align: middle;
font-family: 'Open Sans', sans-serif;
font-size: 14px;
  font-weight: 400;
  line-height: 1.7em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Open Sans';
  font-weight: 700;
  letter-spacing: 0.5px;
  line-height: 1.3em;

}
h1 {
  font-size: 26px;
}
h2 {
  font-size: 22px;
}
h3 {
  font-size: 20px;
}
h4 {
  font-size: 18px;
}
h5 {
  font-size: 16px;
}
h6 {
  font-size: 14px;
}

</style>