html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  background-color: #fff;
  font-family: 'Open Sans', sans-serif;
}

.box {
  width: 50%;
  height: 100%;
  padding: 15px;
  /*margin: auto;*/
}

@media(max-width: 640px){
.box {
  width: 100%;
  height: 100%;
  padding: 15px;
  margin: auto;
}  
}


/* Custom page CSS
-------------------------------------------------- */
/* Not required for template or sticky footer method. */

.footer{
  position: fixed;
  width: 100%;
  bottom: 0px;
}

.container {
  width: auto;
  max-width: 680px;
  padding: 0 15px;
}