.main {
    margin-bottom: 80px;
    border: 1px solid #c8d7e1
}

.btu-calc-form,.main {
    padding: 10px
}

.btu-calc {
    max-width: 315px;
    margin-bottom: 30px;
    border: 1px solid #c8d7e1;
    border-radius: 22px;
    margin: auto;
    margin-bottom: 28px;
}

.btu-calc .group {
    margin-bottom: 1em
}

.btu-calc label {
    display: block
}

.btu-calc input[type=number],.btu-calc input[type=text] {
    background: #fff;
    border-radius: 0;
    border: 1px solid #c8d7e1;
    display: inline-block;
    padding: 7px 14px;
    width: 38%;
    max-width: 98%
}

.btu-calc input[type=submit] {
    background: #494e91;
    border: 1px solid #ecf0f1;
    cursor: pointer;
    display: inline-block;
    margin: 24px 0 0;
    outline: 0;
    font-weight: 600;
    border-radius: 4px;
    padding: 12px 20px;
    color: #fff;
}

.btu-calc input[type=submit]:hover {
    border-color: #a8bece;
    color: #2e4453
}

.btu-calc select {
    background: #fff;
    border-color: #c8d7e1;
    border-style: solid;
    border-radius: 4px;
    border-width: 1px 1px 2px;
    cursor: pointer;
    display: block;
    width: 50%;
    margin: 0;
    outline: 0;
    overflow: hidden;
    font-size: 14px;
    line-height: 21px;
    font-weight: 600;
    text-overflow: ellipsis;
    text-decoration: none;
    vertical-align: top;
    white-space: nowrap;
    box-sizing: border-box;
    padding: 7px 14px 9px 32px
}
.btu-calc select {
    font-size: 15px;
    min-height: 30px;
    -webkit-appearance: none;
    background: #fff url(data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2220%22%20height%3D%2220%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M5%206l5%205%205-5%202%201-7%207-7-7%202-1z%22%20fill%3D%22%23555%22%2F%3E%3C%2Fsvg%3E) no-repeat left 13px top 55%;
    background-size: 16px 16px;
    cursor: pointer;
    vertical-align: middle;
    width: 100%;
    border: 1px solid #ced4da;
    padding: 12px 16px 12px 3px;
    margin-bottom: 30px
}

.btu-calc select option {
    display: block;
    font-size: 20px;
    white-space: pre;
    min-height: 1.2em;
    padding: 0 2px 1px
}

.group-result {
    padding: 15px;
    background: #ebecf9;
}

.group-result input[type=number] {
    width: 50%
}

.group-result label {
    margin-left: 5px;
    display: inline-block
}