body {
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background-color: lightblue;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  background-color: green;
  color: white;
  border: none;
  border-radius: 5px;
  margin-bottom: 20px;
}

table, th, td {
  border: 1px solid black;
  border-collapse: collapse;
  margin-bottom: 20px;
}

th, td {
  padding: 8px 12px;
  text-align: left;
}

footer {
  margin-top: auto;
  width: 100%;
  background-color: #f0f0f0;
  padding: 10px;
  text-align: center;
  border-top: 1px solid #ccc;
  font-size: 0.9em;
}