@font-face {
  font-family: "Lato";
  src: url('http://fonts.googleapis.com/css?family=Lato:400,300');
}

body {
  height: 100%;
  margin: 0;
  background-image: radial-gradient(circle at top right, #03E5E5, #016D6D);
  background-repeat: no-repeat;
  background-attachment: fixed;
  font-family: "Lato", sans-serif;
  font-size: 10px
}
form {
  padding: 4em 4em 2em;
  max-width: 400px;
  margin: 100px auto 100px;
  border-top: 3px solid #016D6D;
  border-bottom: 3px solid #016D6D;
  box-shadow: inset 0 0 1em #016D6D;
  border-radius: 20px;
}

h1 {
  color: #fff;
  font-size: 3em;
  font-weight: 300;
  padding-bottom: .75em;
}

p {
  margin: 0 0 3em 0;
  position: relative;
}

label {
  display: block;
  font-size: 1.6em;
  font-weight: 300;
  margin: 0 0 .7em;
  color: #fff;
}

input {
  display: block;
  box-sizing: border-box;
  width: 100%;
  outline: none
}
input[type="text"],
input[type="password"] {
  background-color: rgba(1, 109, 109, 0.2);
  border: none;
  border-radius: 5px; 
  color: #fff;
  font-size: 1.6em;
  font-weight: 300;
  padding: .8em .5em;
  box-shadow: inset 0 0 .8em #016D6D;
}

input[type="text"]:focus,
input[type="password"]:focus {
  border: 1px solid #fff;
  box-shadow: 0 0 .5em #fff;
}

span {
  border: 1px solid #fff;
  border-radius: 5px;
  display: block;
  font-size: 1.3em;
  text-align: center;
  position: absolute;
  background: transparent;
  left: 105%;
  top: 25px;
  width: 160px;
  padding: 7px 10px;
  color: #fff;
}
span:after {
  right: 100%;
  top: 50%;
  border: solid transparent;
  content: " ";
  height: 0;
  width: 0;
  position: absolute;
  pointer-events: none;
  border-color: rgba(136, 183, 213, 0);
  border-right-color: #fff;
  border-width: 8px;
  margin-top: -8px;
}

input[type="submit"] {
  background-color: transparent;
  border-radius: 5px;
  border: 1px solid #fff;
  color: #fff;
  cursor: pointer;
  display: block;
  font-size: 2em;
  line-height: 1.6em;
  margin: 2em 0 0;
  outline: none;
  padding: .8em 0;
}

input[type="submit"]:hover {
  box-shadow: 0 0 .5em #fff;
}