.parent {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  text-align: center;
  height: calc(100vh - 60px);
}

.parent .child {
  width: 100%;
}

.parent .child .text-404 .text {
  font-size: 6em;
  font-weight: 800;
  line-height: .9em;
}

.parent .child .icon-style {
  color: #396afc;
  font-size: 5em;
  -webkit-animation-duration: 5s;
  animation-duration: 5s;
}

@media screen and (max-width: 600px) {
  .text-404 {
    font-size: 5px;
  }
}