LOGIN FORM BY BOOTSNIPP

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->

<div class="container">
  <div id="login-box">
    <div class="logo">
      <img src="https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQfmm6JSpN1WoxcL0_RsV4MPdM4ztj2k_ARt8WsdsvswCpskMWh" class="img-responsive center-block" class="img img-responsive img-circle center-block"/>
      <h1 class="logo-caption"><span class="tweak">L</span>ogin</h1>
    </div>
      <%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %><!-- /.logo -->
    <div class="controls">
      <%= f.email_field :email, autofocus: true, autocomplete: "email",placeholder: "Username", class: "form-control"%>
      <%= f.password_field :password, autocomplete: "current-password",placeholder: "Password", class: "form-control" %>
     <div class="action">
      <%= f.submit "Login",class: "btn-hover color-signup" %>
    </div>
    </div>
    <%= render "devise/shared/links" %>
    <%end%><!-- /.controls -->
  </div><!-- /#login-box -->
</div><!-- /.container -->

<style>
#login-box {
  position: absolute;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  width: 250px;
  height: 100px;
  margin: 0 auto;
  border: 1px solid black;
  background: rgba(48, 46, 45, 1);
  min-height: 250px;
  padding: 20px;
  z-index: 9999;
}
#login-box .logo .logo-caption {
  font-family: 'Poiret One', cursive;
  color: white;
  text-align: center;
  margin-top: 10px;
  margin-bottom: 10px;
}
#login-box .logo .tweak {
  color: #ff5252;
}
#login-box .controls {
  padding-top: 50px;
}
#login-box .controls input {
  border-radius: 0px;
  background: rgb(98, 96, 96);
  border: 0px;
  color: white;
  font-family: 'Nunito', sans-serif;
}
#login-box .controls input:focus {
  box-shadow: none;
}
#login-box .controls input:first-child {
  border-top-left-radius: 2px;
  border-top-right-radius: 2px;
}
#login-box .controls input:last-child {
  border-bottom-left-radius: 2px;
  border-bottom-right-radius: 2px;
}
.img-responsive, .thumbnail>img, .thumbnail a>img, .carousel-inner>.item>img, .carousel-inner>.item>a>img {
    display: block;
    max-width: 25%;
    }
#login-box button.btn-custom {
  border-radius: 2px;
  margin-top: 8px;
  background:#ff5252;
  border-color: rgba(48, 46, 45, 1);
  color: white;
  font-family: 'Nunito', sans-serif;
}
#login-box button.btn-custom:hover{
  -webkit-transition: all 500ms ease;
  -moz-transition: all 500ms ease;
  -ms-transition: all 500ms ease;
  -o-transition: all 500ms ease;
  transition: all 500ms ease;
  background: rgba(48, 46, 45, 1);
  border-color: #ff5252;
}
#particles-js{
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: 50% 50%;
    position: fixed;
    top: 0px;
    z-index:1;
}
</style>