Editor/App.css

/*.kourtina{
  z-index: 2;
  height: 100vh;
  position: fixed;
  top: 0;
  width: 100%;
}*/
 .mainbar{
    z-index: 1;
    display: flex;
    justify-content: space-between;
    position: fixed;
    height: 48px;
    background: #F1F1F1;
    top: 0;
    width: 100%;
    color:#707070;
    box-shadow: 1px 1px rgb(0, 0, 0,0.16);
}
 .horizontal_bars {

 
  display: flex;
  flex-direction: row;
  justify-content:space-between;
  margin-top: 50px
}

 .horizontal_bars .toolbox{
  width:306px;
  background: #F1F1F1;
  z-index: 1;
  flex-shrink: 0;
  position: fixed;
  height: 100vh;

}

 .horizontal_bars .sidebar{
  width: 311px;
  background: #F1F1F1;
  z-index: 1;

  flex-shrink: 0;
  position: fixed;
  right: 0;
  height: 100vh;

}


.playground{
  margin-top: 20px;
  height: 100vh;
  display: flex;
  justify-content:center; 
}

.phone{
  margin:0 auto;
}