/* index */
#page {
  /*width: 800px;
  height: 450px;*/
  overflow: auto;
  /*background: #333;*/
  text-align: center;
  /*border: solid 3px;*/
}

#navigation_controls {
  text-align: center;
  margin-bottom: 30px;
  margin-top: 30px;
}

#zoom_controls {
  text-align: center;
}

.canvas {
  text-align: center;
}

.container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}

.vist-title {
  text-align: center;
  width: 100%;
  height: 100px;
}

.pic-tan1 {
  width: 320px;
  height: 240px;
}

/* showlist */

.backBut {
  width: 100px;
  height: 20px;
  margin: 0 auto;
}
.but {
  margin-top: 30px;
  text-align: center;
}