html, body {
    height: 100%;
}

html {
    display: table;
    margin: auto;
}

body {
    display: table-cell;
    vertical-align: middle;
}

form {
    margin: 0 auto;
    width: 400px;
    align-content: center;
}

title {
    font-size: 20px;
    font-weight: bold;
    text-align: center;
}

label {
    font-size: 15px;
    font-weight: bold;
}

input {
    width: 100%;
    height: 30px;
    font-size: 15px;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 0 10px;
    box-sizing: border-box;
}

.message {
    padding: 10px;
    margin: 5px;
    background-color: #f3f3f3
}
nav a {
    color: #d64161;
    font-size: 3em;
    margin-left: 50px;
    text-decoration: none;
}


h1 {
    text-align: center;
}

h2 {
    text-align: center;
}

h3 {
    text-align: center;
}

img {
    display: block;
    margin-left: auto;
    margin-right: auto;
    align-content: center;
}

.message {
    padding: 10px;
    margin: 5px;
    background-color: #f3f3f3;
    text-align: center;
}
nav a {
    color: #4169E1;
    font-size: 3em;
    text-decoration: none;
    text-align: center;
}

button {
  position: relative;
  background-color: #04AA6D;
  border: none;
  font-size: 28px;
  color: #FFFFFF;
  padding: 20px;
  width: 400px;
  text-align: center;
  -webkit-transition-duration: 0.4s; /* Safari */
  transition-duration: 0.4s;
  text-decoration: none;
  overflow: hidden;
  cursor: pointer;
}

/* successful login - return to tracker button */

.btn-return-to-tracker:after {
  content: "";
  background: #90EE90;
  display: block;
  position: absolute;
  padding-top: 300%;
  padding-left: 350%;
  margin-left: -20px!important;
  margin-top: -120%;
  opacity: 0;
  transition: all 0.8s
}

.btn-return-to-tracker:active:after {
  padding: 0;
  margin: 0;
  opacity: 1;
  transition: 0s
}

.btn-return-to-tracker {
  position: relative;
  background-color: #04AA6D;
  border: none;
  font-size: 28px;
  color: #FFFFFF;
  padding: 20px;
  width: 440px;
  text-align: center;
  -webkit-transition-duration: 0.4s; /* Safari */
  transition-duration: 0.4s;
  text-decoration: none;
  overflow: hidden;
  cursor: pointer;
}

.btn-return-to-tracker:after {
  content: "";
  background: #90EE90;
  display: block;
  position: absolute;
  padding-top: 300%;
  padding-left: 350%;
  margin-left: -20px!important;
  margin-top: -120%;
  opacity: 0;
  transition: all 0.8s
}

.btn-return-to-tracker:active:after {
  padding: 0;
  margin: 0;
  opacity: 1;
  transition: 0s
}

.btn-return-to-tracker:after {
  content: "";
  background: #90EE90;
  display: block;
  position: absolute;
  padding-top: 300%;
  padding-left: 350%;
  margin-left: -20px!important;
  margin-top: -120%;
  opacity: 0;
  transition: all 0.8s
}

.btn-return-to-tracker:active:after {
  padding: 0;
  margin: 0;
  opacity: 1;
  transition: 0s
}

.btn-return-to-tracker {
  position: relative;
  background-color: #04AA6D;
  border: none;
  font-size: 28px;
  color: #FFFFFF;
  padding: 20px;
  width: 440px;
  text-align: center;
  -webkit-transition-duration: 0.4s; /* Safari */
  transition-duration: 0.4s;
  text-decoration: none;
  overflow: hidden;
  cursor: pointer;
}

.btn-return-to-tracker:after {
  content: "";
  background: #90EE90;
  display: block;
  position: absolute;
  padding-top: 300%;
  padding-left: 350%;
  margin-left: -20px!important;
  margin-top: -120%;
  opacity: 0;
  transition: all 0.8s
}

.btn-return-to-tracker:active:after {
  padding: 0;
  margin: 0;
  opacity: 1;
  transition: 0s
}


/* failed login */

.btn-return-to-auth:after {
  content: "";
  background: #90EE90;
  display: block;
  position: absolute;
  padding-top: 300%;
  padding-left: 350%;
  margin-left: -20px!important;
  margin-top: -120%;
  opacity: 0;
  transition: all 0.8s
}

.btn-return-to-auth:active:after {
  padding: 0;
  margin: 0;
  opacity: 1;
  transition: 0s
}

.btn-return-to-auth {
  position: relative;
  background-color: #EE4B2B;
  border: none;
  font-size: 28px;
  color: #FFFFFF;
  padding: 20px;
  width: 440px;
  text-align: center;
  -webkit-transition-duration: 0.4s; /* Safari */
  transition-duration: 0.4s;
  text-decoration: none;
  overflow: hidden;
  cursor: pointer;
}

.btn-return-to-auth:after {
  content: "";
  background: #EE4B2B;
  display: block;
  position: absolute;
  padding-top: 300%;
  padding-left: 350%;
  margin-left: -20px!important;
  margin-top: -120%;
  opacity: 0;
  transition: all 0.8s
}

.btn-return-to-auth:active:after {
  padding: 0;
  margin: 0;
  opacity: 1;
  transition: 0s
}

.btn-return-to-auth:after {
  content: "";
  background: #EE4B2B;
  display: block;
  position: absolute;
  padding-top: 300%;
  padding-left: 350%;
  margin-left: -20px!important;
  margin-top: -120%;
  opacity: 0;
  transition: all 0.8s
}

.btn-return-to-auth:active:after {
  padding: 0;
  margin: 0;
  opacity: 1;
  transition: 0s
}

.btn-return-to-auth {
  position: relative;
  background-color: #EE4B2B;
  border: none;
  font-size: 28px;
  color: #FFFFFF;
  padding: 20px;
  width: 440px;
  text-align: center;
  -webkit-transition-duration: 0.4s; /* Safari */
  transition-duration: 0.4s;
  text-decoration: none;
  overflow: hidden;
  cursor: pointer;
}

.btn-return-to-auth:after {
  content: "";
  background: #EE4B2B;
  display: block;
  position: absolute;
  padding-top: 300%;
  padding-left: 350%;
  margin-left: -20px!important;
  margin-top: -120%;
  opacity: 0;
  transition: all 0.8s
}

.btn-return-to-auth:active:after {
  padding: 0;
  margin: 0;
  opacity: 1;
  transition: 0s
}