* {
    margin: 0px auto;
    padding: 0px;
    text-align: center;
    font-family: 'Montserrat';
  }
  
  .cotn_principal {
  position: absolute;
  width: 100%;
  height: 100%;
  background: #f6c800; 
  background: -moz-radial-gradient(-32deg,  #f6c800 100%, #020202 100%, #fcfafa 10%); 
  }
  
  
  .cont_centrar {
    position: relative;
    float: left;
     width: 100%;
  }
  
  .cont_login {
  position: relative;
  width: 640px;
  left: 50%;
  margin-left: -320px;
    
  }
  
  .cont_back_info {  
    position: relative;
    float: left;
    width: 640px;
    height: 280px;
    overflow: hidden;
    background-color: #fff;
    margin-top: 100px;
    box-shadow: 1px 10px 30px -10px rgba(0,0,0,0.5);
  }
  
  .cont_forms {
    position: absolute;
    overflow: hidden;
    top:100px;
    left: 0px;
    width: 320px;
    height: 280px;
    background-color: #eee;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  }
  
  .cont_forms_active_login {
  box-shadow: 1px 10px 30px -10px rgba(0,0,0,0.5);
  height: 420px;  
  top:20px;
  left: 0px;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  
  }
  
  .cont_forms_active_sign_up {
  box-shadow: 1px 10px 30px -10px rgba(0,0,0,0.5);
  height: 420px;  
  top:20px;
  left:320px;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  }
  
  .cont_img_back_grey {
    position: absolute;
    width: 950px;
    top:-80px;
    left: -116px;
  }
  
  .cont_img_back_grey > img {
  width: 100%;
  -webkit-filter: grayscale(100%);     filter: grayscale(100%);
  opacity: 0.2;
  animation-name: animar_fondo;
  animation-duration: 20s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  
  }
  
  .cont_img_back_ {
    position: absolute;
    width: 950px;
    top:-80px;
    left: -116px;
  }
  
  .cont_img_back_ > img {
  width: 100%;
  opacity: 0.3;
  animation-name: animar_fondo;
  animation-duration: 20s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  }
  
  .cont_forms_active_login > .cont_img_back_ {
  top:0px;  
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  }
  
  .cont_forms_active_sign_up > .cont_img_back_ {
  top:0px;  
  left: -435px;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  }
   
  
  .cont_info_log_sign_up {
    position: absolute;
    width: 640px;
    height: 280px;
    top: 100px;
  z-index: 1;
  } 
  
  .col_md_login {
    position: relative;
    float: left;
    width: 50%;
  }
  
  .col_md_login > h2 {
    font-weight: 400;
    margin-top: 70px;
    color: #f6c800;
  }
  
  .col_md_login > p {
   font-weight: 400;
  margin-top: 15px;
  width: 80%;
      color: #37474F;
  }
  
  .btn_login { 
  background-color: #000000;
    border: none;
    padding: 10px;
  width: 200px;
  border-radius:3px;
  box-shadow: 1px 5px 20px -5px rgba(0,0,0,0.4);
    color: #fff;
  margin-top: 10px;
  cursor: pointer;
  }
  
  .col_md_sign_up {
    position: relative;
    float: left;
    width: 50%;  
  }
  
  .cont_ba_opcitiy > h2 {
    font-weight: 400;
    color: #fff;
  }
  
  .cont_ba_opcitiy > p {
   font-weight: 400;
  margin-top: 15px;
   color: #fff;
  }
  
  .cont_ba_opcitiy {
    position: relative;
    background-color: rgba(120, 144, 156, 0.55);
    width: 80%;
    border-radius:3px ;
  margin-top: 60px;
  padding: 15px 0px;
  }
  
  .btn_sign_up { 
  background-color: #f6c800;
  border: none;
  padding: 10px;
  width: 200px;
  border-radius:3px;
  box-shadow: 1px 5px 20px -5px rgba(0,0,0,0.4);
  color: #fff;
  margin-top: 10px;
  cursor: pointer;
  }
  .cont_forms_active_sign_up {
  z-index: 2;  
  }
  
  
  @-webkit-keyframes animar_fondo {
  from { -webkit-transform: scale(1) translate(0px);
  -moz-transform: scale(1) translate(0px);
  -ms-transform: scale(1) translate(0px);
  -o-transform: scale(1) translate(0px);
  transform: scale(1) translate(0px); }
  to { -webkit-transform: scale(1.5) translate(50px);
  -moz-transform: scale(1.5) translate(50px);
  -ms-transform: scale(1.5) translate(50px);
  -o-transform: scale(1.5) translate(50px);
  transform: scale(1.5) translate(50px); }
  }
  @-o-keyframes identifier {
  from { -webkit-transform: scale(1);
  -moz-transform: scale(1);
  -ms-transform: scale(1);
  -o-transform: scale(1);
  transform: scale(1); }
  to { -webkit-transform: scale(1.5);
  -moz-transform: scale(1.5);
  -ms-transform: scale(1.5);
  -o-transform: scale(1.5);
  transform: scale(1.5); }
  
  }
  @-moz-keyframes identifier {
  from { -webkit-transform: scale(1);
  -moz-transform: scale(1);
  -ms-transform: scale(1);
  -o-transform: scale(1);
  transform: scale(1); }
    to { -webkit-transform: scale(1.5);
  -moz-transform: scale(1.5);
  -ms-transform: scale(1.5);
  -o-transform: scale(1.5);
  transform: scale(1.5); }
  
  }
  @keyframes identifier {
    from { -webkit-transform: scale(1);
  -moz-transform: scale(1);
  -ms-transform: scale(1);
  -o-transform: scale(1);
  transform: scale(1); }
    to { -webkit-transform: scale(1.5);
  -moz-transform: scale(1.5);
  -ms-transform: scale(1.5);
  -o-transform: scale(1.5);
  transform: scale(1.5); }
  }
  .cont_form_login {
    position: absolute;
    opacity: 0;
  display: none;
    width: 320px;
    -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  }
  
  .cont_forms_active_login {
  z-index: 2;  
  }
  .cont_forms_active_login  >.cont_form_login {
  }
  
  .cont_form_sign_up {
  position: absolute;
  width: 320px;
  float: left;
  opacity: 0;
  display: none;
    -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  }
  
    
  .cont_form_sign_up > input {
  text-align: left;
    padding: 15px 5px;
  margin-left: 10px;
  margin-top: 20px;
    width: 260px;
  border: none;
      color: #636262;
  }
  
  .cont_form_sign_up > h2 {
  margin-top: 50px; 
  font-weight: 400;
    color: #636262;
  }
  
  
  .cont_form_login > input {
    padding: 15px 5px;
  margin-left: 10px;
  margin-top: 20px;
    width: 260px;
  border: none;
  text-align: left;
    color: #636262;
  }
  
  .cont_form_login > h2 {
  margin-top: 110px; 
  font-weight: 400;
  color: #636262;
  }
  .cont_form_login > a,.cont_form_sign_up > a  {
  color: #636262;
  position: relative;
  float: left;
  margin: 10px;
  margin-left: 30px;
  }