header {
    position: relative;
}

.body {
    text-align: center;
}
.container {
    display: flex;
    height: 100%;
    width: 100%;
    padding: 0%;
    margin: 0%;
}

.container div {
    width: 50%;
}

#editor {
    border-right: solid black 1px;
    height: 90vh;
    overflow-y: auto;
}

#image-viewer {
    max-width: 100%;
    height: auto;
}

.btn {
    display: inline-block;
}