style.css

body {
  margin: 0;
  padding: 0;
  font-family: Helvetica, Arial, 'Open Sans', 'Lucida Grande', 'Segoe UI', 'Source Han Sans', 'Source Han Sans CN', 'Hiragino Sans GB', 'Microsoft YaHei', '微软雅黑', 'WenQuanYi Micro Hei', sans-serif;
  color: #333;
  -webkit-font-smoothing: antialiased;
}

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.float-left {
  float: left;
}
.float-right {
  float: right;
}
h1 {
  text-align: center;
  font-weight: 400;
}
h2 {
  margin-top: 1.5em;
  font-weight: 300;
  border-bottom: 1px solid #ddd;
}
p {
  font-size: 15px;
  margin: 0 0 .5em;
}
label {
  display: block;
  margin-bottom: 10px;
}
label input {
  display: block;
  width: 100%;
  padding: 5px;
  font-size: 15px;
  border: 1px solid #999;
}
input[type=submit] {
  -webkit-appearance: none;
  color: rgba(255,255,255,0.87);
  background-color: #106CC8;
  box-shadow: 0 2px 5px 0 rgba(0,0,0,.26);
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  position: relative;
  outline: 0;
  border: 0;
  display: inline-block;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  padding: 0 6px;
  margin: 6px 0;
  line-height: 36px;
  min-height: 36px;
  white-space: nowrap;
  min-width: 88px;
  text-align: center;
  text-transform: uppercase;
  font-weight: 500;
  font-size: 14px;
  font-style: inherit;
  font-variant: inherit;
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
  overflow: hidden;
  transition: box-shadow .4s cubic-bezier(.25,.8,.25,1),background-color .4s cubic-bezier(.25,.8,.25,1);
}
input[type=submit]:hover {
  box-shadow: 0 4px 5px 0 rgba(0,0,0,.5);
}
input[type=submit]:active {
  background-color: #0F5AAE;
}
a.link {
  color: #106CC8;
  text-decoration: none;
  border-bottom: 1px solid;
}
p.bold {
  font-weight: 600;
}

#email-container {
  text-align: center;
  background-color: #ddd;
}
#navigation-bar {
  position: fixed;
  width: 100%;
  padding: 10px 10px 0 10px;
  background-color: #F7F7F7;
  border-bottom: 1px solid #ccc;
  box-shadow: 0 0 2px #bbb;
  overflow: hidden;
}
#email-body {
  padding: 50px 20px;
  display: inline-block;
  max-width: 660px;
  text-align: justify;
  background-color: #fff;
  box-shadow: 0 0 2px #bbb;
}
#navigation-inner-container {
  max-width: 640px;
  margin: auto;
}
#navigation-bar .float-right {
  margin: 0;
  color: #999;
  font-size: 13px;
  font-weight: 100;
  line-height: 30px;
}
#footer {
  padding: 10px 0;
  margin-top: 20px;
  color: #929292;
  font-size: 13px;
  border-top: 1px solid #ccc;
}