I need to convert html and css into one line string this is my code
var buffer bytes.Buffer
buffer.WriteString(fmt.Sprintf("<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'> <html xmlns='http://www.w3.org/1999/xhtml'><head> <meta name='viewport' content='width=device-width, initial-scale=1.0' /> <meta http-equiv='Content-Type' content='text/html; charset=UTF-8' /> <style type='text/css' rel='stylesheet' media='all'> *:not(br):not(tr):not(html) { font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; -webkit-box-sizing: border-box; box-sizing: border-box; } body { width: 100%% !important; height: 100%%; margin: 0; line-height: 1.4; background-color: #F2F4F6; color: #74787E; -webkit-text-size-adjust: none; } a { color: #3869D4; } .email-wrapper { width: 100%%; margin: 0; padding: 0; background-color: #F2F4F6; } .email-content { width: 100%%; margin: 0; padding: 0; } .email-masthead { padding: 25px 0; text-align: center; } .email-masthead_logo { max-width: 400px; border: 0; } .email-masthead_name { font-size: 16px; font-weight: bold; color: #2F3133; text-decoration: none; text-shadow: 0 1px 0 white; } .email-logo { max-height: 50px; } .email-body { width: 100%%; margin: 0; padding: 0; border-top: 1px solid #EDEFF2; border-bottom: 1px solid #EDEFF2; background-color: #FFF; } .email-body_inner { width: 570px; margin: 0 auto; padding: 0; } .email-footer { width: 570px; margin: 0 auto; padding: 0; text-align: center; } .email-footer p { color: #AEAEAE; } .body-action { width: 100%%; margin: 30px auto; padding: 0; text-align: center; } .body-dictionary { width: 100%%; overflow: hidden; margin: 20px auto 10px; padding: 0; } .body-dictionary dd { margin: 0 0 10px 0; } .body-dictionary dt { clear: both; color: #000; font-weight: bold; } .body-dictionary dd { margin-left: 0; margin-bottom: 10px; } .body-sub { margin-top: 25px; padding-top: 25px; border-top: 1px solid #EDEFF2; table-layout: fixed; } .body-sub a { word-break: break-all; } .content-cell { padding: 35px; } .align-right { text-align: right; } h1 { margin-top: 0; color: #2F3133; font-size: 19px; font-weight: bold; } h2 { margin-top: 0; color: #2F3133; font-size: 16px; font-weight: bold; } h3 { margin-top: 0; color: #2F3133; font-size: 14px; font-weight: bold; } blockquote { margin: 1.7rem 0; padding-left: 0.85rem; border-left: 10px solid #F0F2F4; } blockquote p { font-size: 1.1rem; color: #999; } blockquote cite { display: block; text-align: right; color: #666; font-size: 1.2rem; } cite { display: block; font-size: 0.925rem; } cite:before { content: '\2014 \0020'; } p { margin-top: 0; color: #74787E; font-size: 16px; line-height: 1.5em; } p.sub { font-size: 12px; } p.center { text-align: center; } table { width: 100%%; } th { padding: 0px 5px; padding-bottom: 8px; border-bottom: 1px solid #EDEFF2; } th p { margin: 0; color: #9BA2AB; font-size: 12px; } td { padding: 10px 5px; color: #74787E; font-size: 15px; line-height: 18px; } .content { align: center; padding: 0; } .data-wrapper { width: 100%%; margin: 0; padding: 35px 0; } .data-table { width: 100%%; margin: 0; } .data-table th { text-align: left; padding: 0px 5px; padding-bottom: 8px; border-bottom: 1px solid #EDEFF2; } .data-table th p { margin: 0; color: #9BA2AB; font-size: 12px; } .data-table td { padding: 10px 5px; color: #74787E; font-size: 15px; line-height: 18px; } .button { display: inline-block; width: 200px; background-color: #3869D4; border-radius: 3px; color: #ffffff; font-size: 15px; line-height: 45px; text-align: center; text-decoration: none; -webkit-text-size-adjust: none; mso-hide: all; } @media only screen and (max-width: 600px) { .email-body_inner, .email-footer { width: 100%% !important; } } @media only screen and (max-width: 500px) { .button { width: 100%% !important; } } </style> </head><body dir='ltr'> <table class='email-wrapper' width='100%%' cellpadding='0' cellspacing='0'> <tr> <td class='content'> <table class='email-content' width='100%%' cellpadding='0' cellspacing='0'><tr> <td class='email-masthead'> <a class='email-masthead_name' href='https://example-hermes.com/' target='_blank'><img src='https://unie-assets.ams3.digitaloceanspaces.com/images/logo-unie.png' class='email-logo' /></a> </td> </tr><tr> <td class='email-body' width='100%%'> <table class='email-body_inner' align='center' width='570' cellpadding='0' cellspacing='0'>"))
and it returns an invalid string I found one error in css
.button {
width: 100% !important;
}
and in the out put it looks like this
.button { width: 100% !!(MISSING)important;}
