html, body {
  height: 100%;
}

.main-block {
    background-color: gold;
}

.container{
  width:1025px;
}

.vertical-center {
  height:100%;
  width:100%;

  text-align: center;  /* align the inline(-block) elements horizontally */
  font: 0/0 a;         /* remove the gap between inline(-block) elements */
}

.vertical-center:before {    /* create a full-height inline block pseudo=element */
  content: ' ';
  display: inline-block;
  vertical-align: middle;  /* vertical alignment of the inline element */
  height: 100%;
}

.vertical-center > .container {
  max-width: 100%;

  display: inline-block;
  vertical-align: middle;  /* vertical alignment of the inline element */
  font: 16px/1 "Helvetica Neue", Helvetica, Arial, sans-serif;        /* <-- reset the font property */
}