body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
}
.tabs {
  display: flex;
  justify-content: space-around;
  position: fixed;
  bottom: 0;
  width: 100%;
  background: #fff;
  border-top: 1px solid #ccc;
  z-index: 10;
}
.tabs button {
  flex: 1;
  padding: 12px;
  background: none;
  border: none;
  font-size: 14px;
  cursor: pointer;
}
main {
  padding: 20px;
  padding-bottom: 60px;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: left;
}
.price-up {
  color: green;
  font-weight: bold;
}
.price-down {
  color: red;
  font-weight: bold;
}