.dia {
  position: relative;
  padding: 0 0 0 20px;
}

@media screen and (max-width:768px) {
  .dia {
    padding: 0 0 0 18px;
  }
}

.dia::before {
  position: absolute;
  content: "◆";
  left: 0;
}

.flex_box {
  display: flex;
  justify-content: space-between;
}

@media screen and (max-width:768px) {
  .flex_box {
    display: block;
  }
}

.flex_box .left_box,
.flex_box .right_box {
  display: flex;
  flex-direction: column;
  width: calc(50% - 20px);
}

@media screen and (max-width:768px) {

  .flex_box .left_box,
  .flex_box .right_box {
    width: 100%;
  }

  .flex_box .left_box {
    margin: 0 0 28px;
  }
}

.flex_box .txt_box {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 16px;
  border: 1px solid #000;
  background: #fff;
}

.flex_box .txt_box:not(:last-child){
  border: 1px solid #000;
  border-bottom: none;
}

@media screen and (max-width:768px) {

  .flex_box .left_box .txt_box,
  .flex_box .right_box .txt_box {
    padding: 16px 12px;
  }
}