.pbody table,
.solution table,
.probtext table {
  position:relative;
}
.pbody table[border]::after,
.pbody table[style*="margin:auto"]::after,
.pbody table[class]::after,
.solution table[border]::after,
.solution table[style*="margin:auto"]::after,
.solution table[class]::after,
.probtext table[border]::after,
.probtext table[style*="margin:auto"]::after,
.probtext table[class]::after {
    content: "reshu.by";
    display: block;
    right: 3px;
    position: absolute;
    bottom: 3px;
    color: rgba(0,0,0,0.5);
    font-size: 10px;
}
