email.css

/* From https://github.com/leemunroe/responsive-html-email-template */

img {
  border: none;
  -ms-interpolation-mode: bicubic;
  max-width: 100%;
}

body {
  background-color: #f6f6f6;
  font-family: sans-serif;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
  line-height: 1.8;
  margin: 0;
  padding: 0;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

table {
  border-collapse: separate;
  mso-table-lspace: 0pt;
  mso-table-rspace: 0pt;
  width: 100%;
}

table td {
  font-family: sans-serif;
  font-size: 16px;
  vertical-align: top;
}

/* -------------------------------------
  BODY & CONTAINER
------------------------------------- */

.body {
  background-color: #f6f6f6;
  width: 100%;
}

/* Set a max-width, and make it display as block so it will automatically stretch to that width, but will also shrink down on a phone or something */
.container {
  display: block;
  margin: 0 auto !important;
  /* makes it centered */
  max-width: 580px;
  padding: 10px;
  width: 580px;
}

/* This should also be a block element, so that it will fill 100% of the .container */
.content {
  box-sizing: border-box;
  display: block;
  margin: 0 auto;
  max-width: 580px;
  padding: 10px;
}

/* -------------------------------------
  HEADER, FOOTER, MAIN
------------------------------------- */
.main {
  background: #ffffff;
  border-radius: 3px;
  width: 100%;
  padding: 40px;
}

.main.has-header {
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.main-header {
  background: #369eff;
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  color: #ffffff;
}

.wrapper {
  box-sizing: border-box;
  padding: 20px;
}

.content-block {
  padding-bottom: 10px;
  padding-top: 10px;
}

.footer {
  clear: both;
  margin-top: 10px;
  text-align: center;
  width: 100%;
}

.footer td,
.footer p,
.footer span,
.footer a {
  color: #999999;
  font-size: 12px;
  text-align: center;
}

/* -------------------------------------
  TYPOGRAPHY
------------------------------------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  color: #333333;
  font-family: sans-serif;
  font-weight: 400;
  line-height: 1.4;
  margin: 0;
  margin-bottom: 10px;
}

.main-header h1,
.main-header h2,
.main-header h3,
.main-header h4 {
  color: #ffffff;
  text-align: center;
}

h1 {
  font-size: 55px;
  font-weight: 800;
}

h2 {
  font-size: 40px;
  font-weight: 800;
}

h3 {
  font-size: 30px;
  font-weight: 800;
}

h4 {
  font-size: 20px;
  font-weight: 800;
}

h5 {
  font-size: 16px;
  font-weight: 800;
}

p,
ul,
ol {
  font-family: sans-serif;
  font-size: 16px;
  font-weight: 400;
  margin: 0;
  margin-bottom: 15px;
  color: #444444;
}

p li,
ul li,
ol li {
  list-style-position: inside;
  margin-left: 5px;
}

a {
  color: #369eff;
  text-decoration: underline;
}

/* -------------------------------------
  BUTTONS
------------------------------------- */
.btn {
  margin-top: 20px;
  box-sizing: border-box;
  width: 100%;
}

.btn > tbody > tr > td {
  padding-bottom: 0px;
}

.btn table {
  width: auto;
}

.btn table td {
  background-color: #ffffff;
  border-radius: 5px;
  text-align: center;
}

.btn a {
  background-color: #ffffff;
  border: solid 1px #369eff;
  border-radius: 5px;
  box-sizing: border-box;
  color: #369eff;
  cursor: pointer;
  display: inline-block;
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  padding: 12px 25px;
  text-decoration: none;
  text-transform: capitalize;
}

.btn-primary table td {
  background-color: #369eff;
}

.btn-primary a {
  background-color: #369eff;
  border-color: #369eff;
  color: #ffffff;
}

/* -------------------------------------
  OTHER STYLES THAT MIGHT BE USEFUL
------------------------------------- */
.last {
  margin-bottom: 0;
}

.first {
  margin-top: 0;
}

.align-center {
  text-align: center;
}

.align-right {
  text-align: right;
}

.align-left {
  text-align: left;
}

.clear {
  clear: both;
}

.mt0 {
  margin-top: 0;
}

.mb0 {
  margin-bottom: 0;
}

.preheader {
  color: transparent;
  display: none;
  height: 0;
  max-height: 0;
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  mso-hide: all;
  visibility: hidden;
  width: 0;
}

.powered-by a {
  text-decoration: none;
}

hr {
  border: 0;
  border-bottom: 1px solid #f6f6f6;
  margin: 20px 0;
}

/* -------------------------------------
  RESPONSIVE AND MOBILE FRIENDLY STYLES
------------------------------------- */
@media only screen and (max-width: 620px) {
  table[class="body"] h1 {
    font-size: 28px !important;
    margin-bottom: 10px !important;
  }

  table[class="body"] p,
  table[class="body"] ul,
  table[class="body"] ol,
  table[class="body"] td,
  table[class="body"] span,
  table[class="body"] a {
    font-size: 16px !important;
  }

  table[class="body"] .wrapper,
  table[class="body"] .article {
    padding: 10px !important;
  }

  table[class="body"] .content {
    padding: 0 !important;
  }

  table[class="body"] .container {
    padding: 0 !important;
    width: 100% !important;
  }

  table[class="body"] .main {
    border-left-width: 0 !important;
    border-radius: 0 !important;
    border-right-width: 0 !important;
  }

  table[class="body"] .btn table {
    width: 100% !important;
  }

  table[class="body"] .btn a {
    width: 100% !important;
  }

  table[class="body"] .img-responsive {
    height: auto !important;
    max-width: 100% !important;
    width: auto !important;
  }
}

/* -------------------------------------
  PRESERVE THESE STYLES IN THE HEAD
------------------------------------- */
@media all {
  .ExternalClass {
    width: 100%;
  }

  .ExternalClass,
  .ExternalClass p,
  .ExternalClass span,
  .ExternalClass font,
  .ExternalClass td,
  .ExternalClass div {
    line-height: 100%;
  }

  .apple-link a {
    color: inherit !important;
    font-family: inherit !important;
    font-size: inherit !important;
    font-weight: inherit !important;
    line-height: inherit !important;
    text-decoration: none !important;
  }

  #MessageViewBody a {
    color: inherit;
    text-decoration: none;
    font-size: inherit;
    font-family: inherit;
    font-weight: inherit;
    line-height: inherit;
  }

  .btn-primary table td:hover {
    background-color: #34495e !important;
  }

  .btn-primary a:hover {
    background-color: #34495e !important;
    border-color: #34495e !important;
  }
}