The linked and built in exchange from the website, blocktrades, is probably still doing upgrades and maintenance due to a very recent upgrade of the steem protocol.
In the meantime, you can always use another exchange, such as poloniex. Though a bit more in depth of a trading platform and less of a 'one click' solution, you can buy steem there with bitcoin and withdraw to your steem account.
That makes sense. Thanks for info.
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