#year1_select, #mon1_select, #hour1_select, #min1_select, #sec1_select {
      position: absolute;
      left: 280px;
      top: 165px;
      background-color: white;
      display: none;
      padding: 10px;
      border: blue 2px solid;
    }
    #year2_select, #mon2_select, #hour2_select, #min2_select, #sec2_select {
      position: absolute;
      left: 490px;
      top: 165px;
      background-color: white;
      display: none;
      padding: 10px;
      border: blue 2px solid;
    }

    .mon_days {
      background: lightgreen;
      cursor: pointer;
      color: blue;
      text-decoration:underline;
    }

    .current_day {
      background: tomato;
    }

    .cover {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: gray;
      opacity: 0.8;
    }

    #dt_picker {
      border: blue 1px solid;
      width: 500px;
      height: 350px;
      position: absolute;
      left: 200px;
      top: 100px;
      text-align: center;
      background-color: white;
      display: none;
    }

    #year1, #mon1, #hour1, #min1, #sec1,
    #year2, #mon2, #hour2, #min2, #sec2,
    #m1, #m1_prev, #m1_next,
    #m2, #m2_prev, #m2_next {
        cursor: pointer;
        color: blue;
        text-decoration:underline;
    }