styles.css

html {
    height: 100%;
    font-size: 18px;
}

body {
    overflow: hidden;
    width: 100%;
    height: 100%;
    display: flex;
    margin: 0;
    padding: 0;
    justify-content: space-between;
}

body:after {
    content : "";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    background-image: url("img/bigml-logo.png");
    background-repeat: no-repeat;
    background-position: calc(50% - 100px) 50%;
    width: 100%;
    height: 100%;
    opacity : 0.3;
    z-index: -1;
}

#main {
    flex-grow: 1;
    flex-shrink: 0;
    flex-basis: 600px;
}

#sidebar {
    flex-grow: 0;
    flex-shrink: 0;
    flex-basis: 250px;
    background-color: rgb(211, 228, 185);
    border-left: 1px solid #ccc;
}

#sidebar-vert {
    display: flex;
    flex-direction: column;
    flex-basis: 100px;
    align-items: center;
    margin-top: 15px;
}

#fileindex-slider {
    width: 90%;
    margin-left: 5%;
}

#fileindex-label {
    margin-left: 10px;
}

#control-region {
    padding: 10px;
    display: flex;
}

#svg-region {
    margin: auto;
    height: 93%;
    width: 95%;
    image-rendering: pixelated;
}

#main-svg {
    height: 100%;
    width: 100%;
    border: 1px solid #ccc;
    background: repeating-linear-gradient( -45deg, #fff 0px, #fff 4px, #ddd 5px, #fff 6px);
}

.anno-box {
    pointer-events: none;
    stroke: #ff5555;
    fill: #ff5555;
    stroke-width: 2;
    stroke-opacity: 0.8;
    fill-opacity: 0.2;
}

input[type="file"] {
    display: none;
}

.button {
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #fff;
    color: #444;
    margin-bottom: 10px;
    width: 160px;
    padding-top: 8px;
    padding-bottom: 8px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
}

.button:hover {
    border: 1px solid #888;
    background-color: #444;
    color: #fff;
}

#annot-group {
    width: 96%;
    flex-flow: column;
    align-items: center;
    padding: 4px;
    margin-top: 15px;
    border-top: 1px solid #444;
}

#mode-group {
    margin-bottom: 10px;
}

#mode-label {
    vertical-align: middle;
}

.annots {
    display: flex;
    flex-flow:row wrap;
}

.annot-label {
    text-align: center;
    font-size: 20px;
    min-width: 18px;
    padding: 4px;
    margin: 2px;
    border: 3px solid;
    border-radius: 6px;
}

.closable-label {
    min-width: 18px;
    padding: 4px;
    margin: 2px;
    border: 3px solid;
    border-radius: 6px;
    background: white;
}

/* Style the close button (span) */
.close {
  cursor: pointer;
  text-align: right;
  width: 100%;
  background: white;
}