.wrapper_beton_lestn { 
	width: 100%;
	margin: 0 auto;
	max-width: 800px;
	box-shadow: rgb(132, 61, 179) 2px 2px 15px;
	border: 8px solid gray;
	box-sizing: border-box;
	padding: 8px;
	min-height: 350px;
}
table input {
	text-align: center;
}
legend {
	margin: 10px 0 5px 0 !important;
}
td {
	padding: 1px !important;
	text-align: center;
	vertical-align: middle !important;
}
th, thead {
	text-align: center !important;
	position: sticky;
  	top: -2px;
  	background: white;
  	vertical-align: middle !important;
}
table {
	margin-top: 15px;
	font-size: 0.9em !important;
}
output {
	color: blue !important;
	font-size: 1em !important;
	font-weight: bold;
}
.row_stairs {
	display: flex;
	justify-content: space-between;
	flex-wrap: wrap;
}
.ico_stairs {
	border: 1px solid gray;
	margin: 5px;
}
.ico_stairs:hover {
	box-shadow: rgb(132, 61, 179) 2px 2px 15px;
}
.ico_stairs img {
	width: 100%;
	max-width: 130px;
}
.block-stair1 img,
.block-stair2 img,
.block-stair3 img,
.block-stair4 img {
	width: 100%;
	max-width: 430px;
}
.dimension {
	display: flex;
	flex-wrap: wrap;
}
.image-d {
	flex-grow: 1;
	text-align: center;
}
.dimension-block {
	flex-grow: 1;
	width: 290px;
}
.btn1 {
	margin: 10px 0 !important;
}
@media (max-width: 600px) {
	.wrapper_beton_lestn {
		padding: 5px !important;
		border: 5px solid gray;
	}
	table {
		font-size: 0.85em !important;
	}
	.input-group-addon {
		padding: 5px !important;
	}
}