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https://cdn-images.mailchimp.com/embedcode/classic-10_7.css



The cleaned CSS file size is 0% smaller


100% of the CSS selectors are used
 

Preview of the changes in the CSS file:
/* MailChimp Form Embed Code - Classic - 12/17/2015 v10.7 */
#mc_embed_signup form {display:block; position:relative; text-align:left; padding:10px 0 10px 3%}
#mc_embed_signup h2 {font-weight:bold; padding:0; margin:15px 0; font-size:1.4em;}
#mc_embed_signup input {border: 1px solid #ABB0B2; -webkit-border-radius: 3px; -moz-border-radius: 3px; border-radius: 3px;}
#mc_embed_signup input[type=checkbox]{-webkit-appearance:checkbox;}
#mc_embed_signup input[type=radio]{-webkit-appearance:radio;}
#mc_embed_signup input:focus {border-color:#333;}
#mc_embed_signup .button {clear:both; background-color: #aaa; border: 0 none; border-radius:4px; transition: all 0.23s ease-in-out 0s; color: #FFFFFF; cursor: pointer; display: inline-block; font-size:15px; font-weight: normal; height: 32px; line-height: 32px; margin: 0 5px 10px 0; padding: 0 22px; text-align: center; text-decoration: none; vertical-align: top; white-space: nowrap; width: auto;}
#mc_embed_signup .button:hover {background-color:#777;}
#mc_embed_signup .small-meta {font-size: 11px;}
#mc_embed_signup .nowrap {white-space:nowrap;}

#mc_embed_signup .mc-field-group {clear:left; position:relative; width:96%; padding-bottom:3%; min-height:50px;}
#mc_embed_signup .size1of2 {clear:none; float:left; display:inline-block; width:46%; margin-right:4%;}
* html #mc_embed_signup .size1of2 {margin-right:2%; /* Fix for IE6 double margins. */}
#mc_embed_signup .mc-field-group label {display:block; margin-bottom:3px;}
#mc_embed_signup .mc-field-group input {display:block; width:100%; padding:8px 0; text-indent:2%;}
#mc_embed_signup .mc-field-group select {display:inline-block; width:99%; padding:5px 0; margin-bottom:2px;}

#mc_embed_signup .datefield, #mc_embed_signup .phonefield-us{padding:5px 0;}
#mc_embed_signup .datefield input, #mc_embed_signup .phonefield-us input{display:inline; width:60px; margin:0 2px; letter-spacing:1px; text-align:center; padding:5px 0 2px 0;}
#mc_embed_signup .phonefield-us .phonearea input, #mc_embed_signup .phonefield-us .phonedetail1 input{width:40px;}
#mc_embed_signup .datefield .monthfield input, #mc_embed_signup .datefield .dayfield input{width:30px;}
#mc_embed_signup .datefield label, #mc_embed_signup .phonefield-us label{display:none;}

#mc_embed_signup .indicates-required {text-align:right; font-size:11px; margin-right:4%;}
#mc_embed_signup .asterisk {color:#e85c41; font-size:150%; font-weight:normal; position:relative; top:5px;}     
#mc_embed_signup .clear {clear:both;}

#mc_embed_signup .mc-field-group.input-group ul {margin:0; padding:5px 0; list-style:none;}
#mc_embed_signup .mc-field-group.input-group ul li {display:block; padding:3px 0; margin:0;}
#mc_embed_signup .mc-field-group.input-group label {display:inline;}
#mc_embed_signup .mc-field-group.input-group input {display:inline; width:auto; border:none;}

#mc_embed_signup div#mce-responses {float:left; top:-1.4em; padding:0em .5em 0em .5em; overflow:hidden; width:90%; margin: 0 5%; clear: both;}
#mc_embed_signup div.response {margin:1em 0; padding:1em .5em .5em 0; font-weight:bold; float:left; top:-1.5em; z-index:1; width:80%;}
#mc_embed_signup #mce-error-response {display:none;}
#mc_embed_signup #mce-success-response {color:#529214; display:none;}
#mc_embed_signup label.error {display:block; float:none; width:auto; margin-left:1.05em; text-align:left; padding:.5em 0;}

#mc-embedded-subscribe {clear:both; width:auto; display:block; margin:1em 0 1em 5%;}
#mc_embed_signup #num-subscribers {font-size:1.1em;}
#mc_embed_signup #num-subscribers span {padding:.5em; border:1px solid #ccc; margin-right:.5em; font-weight:bold;}

#mc_embed_signup #mc-embedded-subscribe-form div.mce_inline_error {display:inline-block; margin:2px 0 1em 0; padding:5px 10px; background-color:rgba(255,255,255,0.85); -webkit-border-radius: 3px; -moz-border-radius: 3px; border-radius: 3px; font-size:14px; font-weight:normal; z-index:1; color:#e85c41;}
#mc_embed_signup #mc-embedded-subscribe-form input.mce_inline_error {border:2px solid #e85c41;}
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