/*common css*/
html 
{
 overflow: auto;
}
 
html, body, div, iframe 
{
 margin: 0px; 
 padding: 0px; 
 /*height: 100%; */
 border: none;
}

.book iframe 
{
 display: block; 
 width: 100%; 
 border: none; 
 overflow-y: auto; 
 overflow-x: hidden;
 margin: 20px 0px 40px;
 border: 1px solid #d9d9d9 !important;
}

<iframe src="https://booking.setmore.com/scheduleappointment/955d084a-aef7-43d2-a3a8-22a1097faa31"
    frameborder="0" 
    marginheight="0" 
    marginwidth="0" 
    width="100%" 
    height="100%" 
    scrolling="auto"></iframe >