#chatBox {
    padding-top: 20px;
    padding-bottom: 20px;
    height: 300px;
}

.contentBox {
  	border: 1px solid black;
  	padding-left: 20px;
  	padding-right: 20px;
 	overflow: scroll;
  	background-color: rgb(255, 255, 255);
}
  
.overlay {
    height: 0%;
    width: 100%;
    position: fixed;
    z-index: 3;
    top: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.9);
    overflow-y: hidden;
    transition: 0.5s;
}

.overlay-container {
    position: relative;
    top: 50%;
    left: 50%;
    padding-left: 10%;
    padding-right: 10%;
    transform: translateX(-50%) translateY(-50%);
    text-align: center;
    margin-top: 30px;
}

.overlay-content {
    background-color: rgb(255, 255, 255);
}

#stopExperiment {
  z-index: 5;  
}