body, html {
  width: 100%;
  height: 100%;
  justify-content: center;
  margin: 0;
}

.container {
    display: flex;
    width: 100%;
    height: 100%;
    align-items: center;
	
}

.leftpane {
    flex-grow: 1;
    float: left;
    background-color: white;
    height: 70%;
}
.rightpane {
    flex-grow: 1;
    float: right;
    background-color: white;
    height: 70%;
}

.middlepane {
    width: 1000px;
    height: 100%;
    float: none;
    background-color: white;
    border-collapse: collapse;
}



.toppane {
  width: 100%;
  height: 30%;
  border-collapse: collapse;
  background-color: #4da6ff;
}