.converter {
    background: #eef;
    border: 1px solid silver;
    padding: 2em;
    display: inline-block;
    margin-bottom: 2em;
}

.converter h2 {
    margin-top: 0px;
    margin-bottom: 0px;
}

.converter table tr td {
    text-align: center;
}

.button {
    margin-top: 1em;
}

.middle {
    font-size: xx-large;
    font-weight: bolder;
    padding-left: 2em;
    padding-right: 2em;
}

.history{
    padding-left: 2em;
}

.label {
    text-align: right;
}

.error_report {
    padding-top: .5em;
    text-align: center;
    color: red;
}

.explanation {
    font-size: smaller;
    font-style: italic;
}