.answer {
    border: 1px solid #aaa;
    padding: 5px;
    position: absolute;
    top: 40%;     
    left: 50%;
    transform: translateX(-50%); 
    width: 80%;
    min-height: 100px;
    box-sizing: border-box;
}

.rich-text-editor img[src^="data:image/svg+xml"] {
    vertical-align: middle;
    margin: 4px;
    padding: 3px 10px;
    cursor: pointer;
    border: 1px solid transparent;
}

#MathJax_Message {
    display: none;
}

.container {
    margin-right: auto;
    margin-left: auto;
    padding-left: 15px;
    padding-right: 15px
}

@media (min-width: 768px) {
    .container {width: 750px;}
}

@media (min-width: 992px) {
    .container {width: 970px;}
}

@media (min-width: 1200px) {
    .container {width: 1170px;}
}

.result {
    display: none
}