html,
body,
.fullscreen {
    height: 100vh;
}

body {
    margin: 0;
}

.fullscreen {
    display: flex;
    overflow: hidden;
    flex-direction: column;
}

.fullscreen > header {
    cursor: pointer;
}

header,
footer {
    padding: 10px;
    background: #555;
    color: white;
}
header > span {
    float:right;
}
.header {
    background: #555;
    color: white;
    display: flex;
    /* overflow: hidden; */
    /* padding: 10px 0; */
}


main {
    flex: 1 1 auto;
    display: flex;
    overflow: hidden;
}

main>* {
    flex: 0 0 auto;
    overflow: auto;
}

.v_separator {
    height: 100%;
    width: .5%;
    cursor: col-resize;
}

.left {
    width: 19.5%;
}

.middle {
    width: 80%;
    white-space: nowrap;
}

h1 {
    margin-top: 0;
}


/*Scroll Bars*/
/* width */
::-webkit-scrollbar {
    width: 8px;
  }
  
  /* Track */
  ::-webkit-scrollbar-track {
    background: #f1f1f1; 
  }
   
  /* Handle */
  ::-webkit-scrollbar-thumb {
    background: #888; 
  }
  
  /* Handle on hover */
  ::-webkit-scrollbar-thumb:hover {
    background: #555; 
  }