html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

.landing-page {
  height: 40%;
  display: flex;
  flex-direction: column; 
  justify-content: center;
  align-items: center;
  background-color: #f2f2f2; 
}

.centered-content {
  text-align: center;
  margin-bottom: 20px; 
}

.landing-page img {
  max-width: 100%; 
}

.table {
  display: table;
  width: 60%;
  height: 60%;
  margin: 0 auto;
}

thead th {
  background-repeat: no-repeat;
  background-position: right center;
}

thead th.up {
  padding-right: 20px;
  background-image: url(data:image/gif;base64,R0lGODlhFQAEAIAAACMtMP///yH5BAEAAAEALAAAAAAVAAQAAAINjI8Bya2wnINUMopZAQA7);
}

thead th.down {
  padding-right: 20px;
  background-image: url(data:image/gif;base64,R0lGODlhFQAEAIAAACMtMP///yH5BAEAAAEALAAAAAAVAAQAAAINjB+gC+jP2ptn0WskLQA7);
}