/*** for PC Browser ***/
@media (min-width:401px)
{
.speakerdeck-iframe
{
    max-width: 600px;
    display: block;
    margin: 0 auto;
}
}


/*** for Smart Phone ***/
@media (max-width:400px)
{
.speakerdeck-iframe
{
    max-width: 98%;
    display: block;
    margin: 0 auto;
}
}