body {
    background-color: #EEEEEE;
}


#setting_panel {
    display:none;
    clear:both;
    border:1px solid lightgray;
    background-color:#F8F8FF;
}

#button_panel {
    display: flex;
}


#main_panel {
    display: flex;
}

#network_panel {
    width:  70%;
    height: 800px;
    flex-grow: 1;
    border: 1px solid lightgray;
    background-color:#F8F8FF;
}

#blockchain_panel {
    width:  30%;
    height: 800px;
    flex-grow: 1;
    border: 1px solid lightgray;
    background-color:#F8F8FF;
}

#timestamp_area {
    text-align: center;
    font: 20pt arial;
}