article {
   text-align: justify;
}

hr {
   margin: 15px auto;
   width: 90%;
}

iframe {
   border: 3px solid black;
   border-radius: 10px;
   box-shadow: 6px 6px 13px #656565;
}

li {
   list-style: none;
   text-align: left;
}

ol li {
   list-style: decimal;
}

.contain {
   width: 80%;
   padding: 5px;
   border-bottom: 1px solid black;
}

.contain:nth-child(odd) {
   background-color: #e9e9e9;
}

.lt{
   display: inline-block;
   margin: 0 auto;
   width: 50px;
   font-weight: bold;
   text-align: center;
}

.md {
   display: inline-block;
   padding-left: 10px;
   text-align: left;
}

.rt{
   padding-left: 100px;
}