Memperbaiki css header dan footer

.wrapper {
  min-height: 100%;
  height: auto !important;
  height: 100%;
  margin: 0 auto -4em;
  overflow-y: scroll;
}
.footer {
  bottom: 0;
  height: 4em;
  position: fixed;
}
.header {
  top: 0%;
  height: 4em;
  position: fixed;
}
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