.demo-container {
    display: flex;
    justify-content: center;
    height: 60px;
    background-color: #cacaca17;
}
#pdfIdentifier{
    overflow:auto;
}
.buttons-demo {
    width: 600px;
    align-self: center;
}

.buttons-column > .column-header {
    flex-grow: 0;
    width: 150px;
    height: 35px;
    font-size: 130%;
    opacity: 0.6;
    text-align: left;
    padding-left: 15px;
}

.buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

    .buttons > div {
        width: 300px;
        flex-wrap: nowrap;
        display: flex;
    }

.buttons-column > div {
    width: 70px;
    height: 50px;
    text-align: center;
}

.buttons-column {
    width: 70px;
    justify-content: center;
}
.preview_container {
   /* display: flex;*/
    justify-content: center;
    height: 450px;
    overflow:auto;
}