/* CSSリセット */
body {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background-color: #f5f5f5;
  margin: 0; /* デフォルトのmarginを削除 */
  padding: 0; /* デフォルトのpaddingを削除 */
  box-sizing: border-box;
}
#header {
  margin-top: 0;
  flex-shrink: 0;
  text-align: center;
}

#container {
  margin-top: 1rem;
  flex: 1;
  overflow-y: auto;
  text-align: center;
}

#footer {
  text-align: center;
  flex-shrink: 0;
  margin-top: auto;
}

#calcTable {
  display: flex;
  justify-content: center;
  align-items: center;
}

#calc {
  border: 1px solid black;
  padding: 0px;
}

#calc td {
  border: 1px solid black;
  padding: 20px;
}