html,
body {
  height: 100%;
}

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

.centralizarImagem { 
    display: flex;
    display: -webkit-flex;
    justify-content: center;
    align-items: center;
}