h1 {
    text-align: center;

}

.leftright {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}

.side {
    display: flex;
    flex-direction: row;
  }
.buffer {
    flex-grow: 1;
    border: solid blue 1px;
}
.triangle {
    flex-grow: 0;
    border: solid red 1px;

}
.mydate {
    width: 14.285%;
    height: 20px;
    border: solid red 1px;
    padding-left: 10px;
    box-sizing: border-box;
}