.export-tool-container {
    height: 100%;
    text-align: center;
}
.export-tool-textarea-container {
    height: 70%;
}
.export-tool-select {
    min-width: 70px;
}
.export-tool-textarea {
    width: 90%;
    max-width: 90%;
    background-color: black;
    color: white;
    -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
    -moz-box-sizing: border-box;    /* Firefox, other Gecko */
    box-sizing: border-box;
}

.export-tool-container {
    height: 100%;
    text-align: center;
}

.export-tool-textarea-container {
    height: 70%;
}

.export-tool-select {
    min-width: 70px;
}

.export-tool-textarea {
    width: 90%;
    max-width: 90%;
    min-height: 250px;
    background-color: black;
    color: white;
    -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
    -moz-box-sizing: border-box; /* Firefox, other Gecko */
    box-sizing: border-box;
}

Add minimum height to box
Add minimum height to box
