audio {
  width: 100%;
}

table {
  display: block;
  table-layout: fixed;
  white-space: nowrap;
  overflow-x: auto;
  margin: 0 auto;
  width: 1000px;
  -webkit-overflow-scrolling: touch;
}

img {
  max-width: 100%;
  height: auto;
  margin: auto;
  padding-bottom: 20px;
  padding-top: 20px;
}

th, td {
  height: 100px;
  width: 200px;
  vertical-align: middle;
  text-align: center;
  padding: 0 15px;
  border: 1px solid #ccc;
}

.audio-column {
  width: 400px;
}

audio {
  width: 100%;
}

.td_audio {
  width: 500px;
  vertical-align: middle;
  text-align: center;
}

.td_fixed {
  width: 200px;
  vertical-align: middle;
  text-align: center;
  position: sticky;
  top: 0;
  background: rgb(61, 60, 60);
  color: #ffffff;
  z-index: 3;
}

.td_fixed.acoustic_model {
  left: 130px; /* 1列目の幅を反映 */
}

.td_fixed.vocoder_part {
  left: 293px; /* 1列目と2列目の幅を合計して反映 */
}

.td_fixed.method {
  left: 0;
  width: 100px;
}

.td_fixed:before {
  content: "";
  position: absolute;
  top: 0px;
  left: -1px;
  width: 100%;
  height: 100%;
  border: 1px solid #ccc;
}