.explainys
{
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
    margin-bottom: 6px;
    padding: 6px;

    background-color: #f7f7f7;

         -o-box-sizing: border-box;
}
.explainys > p
{
    -webkit-hyphens: auto;
       -moz-hyphens: auto;
            hyphens: auto;
}

.explainys > summary
{
    cursor: pointer;
}
.explainys > summary:focus
{
    outline: none;
}
.explainys-title
{
    display: inline-block;

    width: 75%;

    vertical-align: top;
    word-break: break-all;
}
.explainys-number
{
    font-family: Monospace;

    display: inline-block;
    float: right;
}
.explainys-number::after
{
    content: ']';
}
.explainys-number::before
{
    content: '[';
}