html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #f5f5f5;
}

.main_div {
  width: 100%;
  max-width: 330px;
  padding: 15px;
  margin: auto;
}

.svg_invert {
  -webkit-filter: invert(100%); /* safari 6.0 - 9.0 */
          filter: invert(100%);
}

.svg_opacity{
opacity:0.8;
}