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HTML 

              
                <!---ESTO ACTIVA EL NUEVO ESTILO, SE PUEDE BORRAR--->
<input id="oldui" type="checkbox" />
<label class="ctrl" for="oldui">activar estilo nuevo</label>

<!---=================================
MAQUETADO ORIGINAL DEL LOGGIN DE SAMCW
======================================--->

<body bgcolor="D1D2E6">
  <br>
  <br>
  <br>
  <br>
  <br>

  <table border="1" align="center">

    <tbody>
      <tr>
        <td><img src="http://i65.tinypic.com/9pxemb.png"></td>
      </tr>

      <form name="acceso" action="procesar_acceso.php" method="post"></form>
      <tr>
        <td>
          <center>
            <table class="tabla" border="1">
              <tbody>
                <tr>
                  <td>
                    <center><img src="http://i68.tinypic.com/2pre9dy.jpg"></center>
                  </td>
                  <td>
                    <center><img src="http://i66.tinypic.com/2rhwmew.png"></center>
                  </td>
                </tr>
                <tr>
                  <td>
                    <input name="usua" type="text" size="20" maxlength="20">
                  </td>
                  <td>
                    <input name="clav" type="password" size="20" maxlength="20">
                  </td>
                </tr>
              </tbody>
            </table>

          </center>
        </td>
      </tr>

      <tr>
        <td>
          <center>
            <input type="button" value="  >  " onclick="acceso.submit()">
          </center>
        </td>
      </tr>

      <tr>
        <td>
          <a href="http://advance.tk"><img src="http://i68.tinypic.com/98bjtk.png"></a>
        </td>
      </tr>

    </tbody>
  </table>
</body>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Exo:700,700italic,900,900italic);
@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700,300,400italic,700italic);

*{box-sizing: border-box; transition: all ease .3s;}

#oldui:checked ~ br{display: none;}

html, body
{
  padding: 0;
  margin: 0;
  font-size: 16px;
  background-color: rgba(214,211,230,1);
  min-height: 100vh;
  position: relative;
  text-align: center;
  color: rgba(0,0,0,.75);  
  font-weight: 400;
  z-index: -2;
}

table{   background-color: #fff;   }
[type="button"] {
  background-color: #0000e4;
  margin: 10px;
  font-size: large;
  font-weight: bold;
  cursor: pointer;
  border-radius: 5px;
  border: solid 1px #000;
  color: #FFF;}
[type="button"]:hover {
    background-color: #FFF;
    color: #000;
}

/*agragan la imagen de fondo y el color*/
body::before,
body::after
{
  content:'';
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  display: block;
  position: absolute;
  z-index: -1;  
  background-color: rgba(214,211,230,.5);
}

/*imagen de fondo*/
body::after
{
  background-image: url("../imagenes/login-bkg.png");/*esta es la ruta*/
  background-image: url("http://i68.tinypic.com/2rwnrle.png");
  background-size: cover;
  background-repeat: no-repeat;
  z-index: -2;
}

/*tabla loggin*/
#oldui:checked ~ table
{
  position: relative;
  z-index: 2;
  background-color: #fff;
  background-color: rgba(255,255,255,.7);
  border: none;
  min-height: 100vh;
  width: 100%;
  max-width: 400px;
  cell-spacing: 0;
  border-spacing: none;
  border-collapse: collapse;
  font-family: "open sans", Arial, Helvetica, sans-serif;
  color: gray;
  text-align: center;
}

/*quitar blanco de fondo en tabla interna*/
#oldui:checked ~ table .tabla
{
  background: none;
}

/*elimina los bordes*/
#oldui:checked ~ table td
{
  border: none;
}

/*titulo logo tabla login*/
#oldui:checked ~ table>tbody>tr:first-child td
{
  position: relative;
  vertical-align: bottom;
  font-family: "exo", georgia, serif;
  height: 300px;
  height: 30vh;
  font-size: 2em;
  font-weight: 900;
  color: rgba(12,13,82,1);
  padding: .5em 0;
}

/*logo unicamente con tipografía*/
#oldui:checked ~ table>tbody>tr:first-child td::before
{
  content: 'SAMCW';
}

/*linea blanca debajo del logo*/
#oldui:checked ~ table>tbody>tr:first-child td::after
{
  content: '';
  display: block;
  position: absolute;
  width: 80%;
  height: 2px;
  background-color: #fff;
  bottom: 0;
  left: 10%;
}

/*pie de pagina tabla login*/
#oldui:checked ~ table>tbody>tr:last-child td
{
  vertical-align: middle;
  height: 50px;
  height: 7vh;
  font-size: 1em;
  font-weight: 400;
  background-color: rgba(12,13,82,1);
  color: #fff;
  position: relative;
}

/*pie de pagina creditos tabla loggin*/
#oldui:checked ~ table>tbody>tr:last-child td a::before
{
  content:'www.advance.tk';
}

#oldui:checked ~ table>tbody>tr:last-child td a
{
  color: #fff;  
  text-decoration: none;
}

#oldui:checked ~ table>tbody>tr:nth-child(4) td
{
  height: 30vh;
  vertical-align: top;
  padding: 1em;
}

/*imagenes usadas en las tablas*/
#oldui:checked ~ table img
{
  position: absolute;
  display: none;
}

/*estilos al input button*/
#oldui:checked ~ table [type="button"],
.ctrl
{
  font-size: 0.9em;
  padding: 1em 1.5em;
  background-color: rgba(35,35,207,1);
  border: none;
  border-radius: 50px;
  color: rgb(255, 255, 255);
  box-shadow: 
    inset 0 -1em 1em rgba(27,31,148,1),
    inset 0 -6em 0em rgba(35,35,207,1),   
    inset 0 0em 0em rgba(60,60,230,1),
    0 .2em 0 0 rgba(12,13,82,1);
}

/*estilos al input button en estados hover y focus*/
#oldui:checked ~ table [type="button"]:hover,
#oldui:checked ~ table [type="button"]:focus
{
  transform: translateY(-0.2em);
  box-shadow: 
    inset 0 -1em 1em rgba(27,31,130,1),
    inset 0 -2em 1em rgba(35,35,207,1),   
    inset 0 -3em 1em rgba(60,60,230,1),
    0 .4em 0 0 rgba(12,13,82,1);
  outline: none;
}

/*estilos al input button al click*/
#oldui:checked ~ table [type="button"]:active
{
  box-shadow: none;
  transform: initial;
}

/*login tabla interna*/
#oldui:checked ~ table .tabla
{
  border: none;
  width: 80%;
}
/*login tabla interna y sus input*/
#oldui:checked ~ table .tabla input
{
  font-size: 1.2em;
  border: none;
  width: 100%;
  padding: 0.8em 1.5em;
  background: rgba(255,255,255,1);
  color: rgba(35,35,207,1);
  min-height: 1.5rem;
}

#oldui:checked ~ table .tabla input:focus
{
  outline: none;
  box-shadow: inset 2px 2px 1em 0 rgba(35,35,207,.15); 
}

/*login tabla interna y sus celdas*/
#oldui:checked ~ table .tabla td
{
  padding: 4vh 0 0;
  display: block;
  overflow: hidden;
  position: relative;
}

/*textos para inputs*/
#oldui:checked ~ table .tabla tr:last-child td::before
{
  font-size: 0.8rem;
  display: block;
  position: absolute;
  pointer-events: none;
  text-align: left;
  padding: 0.3em 0.8em;
  color: gray;
  top: 5px;
  color: rgba(28,28,187,.5);
  animation: sube ease 1s backwards;
}

#oldui:checked ~ table .tabla tr:last-child td:nth-child(1)::before
{
  content: 'usuario';  
}

#oldui:checked ~ table .tabla tr:last-child td:nth-child(2)::before
{
  content: 'contraseña';  
}

/*hack webkit para diligenciado automatico*/
#oldui:checked ~ table .tabla input:-webkit-autofill
{
  background: red;
}

/*iconos de usuario y contraseña*/
#oldui:checked ~ table .tabla tr:last-child td::after
{
  content: '';
  display: block;
  position: absolute;
  right: -0.5rem;
  bottom: -0.5rem;
  font-family: "FontAwesome";
  color: #0C0D52;
  pointer-events: none;
  width: 100%;
  text-align: right;
  animation: icono ease 1s backwards;
}

/*iconos inputs*/
#oldui:checked ~ table .tabla tr:last-child td:hover::after
{
  color: #1C56CD;
}

/*icono de usuario*/
#oldui:checked ~ table .tabla tr:last-child td:nth-child(1)::after
{
  right: -0.3rem;
  font-size: 4.5em;
  content: '\f007';
}

/*icono de contraseña*/
#oldui:checked ~ table .tabla tr:last-child td:nth-child(2)::after
{
  font-size: 4.3em;
  content: '\f084';
}

/*oculta las celdas de usuario y contraseña*/
#oldui:checked ~ table .tabla tr:first-child
{
  display: none;
}




/*======================================
ESTOS ESTILOS SON NECESARIOS SON PARA
HACER FUNCIONAR EL BOTON SIN JS
========================================
Controlador css para cambiar los estilos
*/
.ctrl, #oldui
{
  position: absolute;
}

.ctrl::selection
{
  background-color: #ABC700;
}

.ctrl
{
  background-color: #ABC700;
  display: block;
  padding: 1em 2em;
  bottom: 5%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  cursor: pointer;
  font-family: "open sans", Arial, Helvetica, sans-serif;
}

.ctrl:hover
{
  box-shadow: 
    inset 0 3em 0 0 #ABC700;
  transition: all ease 1s;
}

.ctrl:active
{
  transform: 
    translateX(-50%) 
    translateY(20px);
}

#oldui
{
  top: 0;
  left: 0;
  opacity: 0;
}

#oldui:checked ~ .ctrl
{
  bottom: calc(100% - 4.5em);
  left: 1em;
  transform: translateX(0)
}

#oldui:checked ~ .ctrl::before
{
  content: 'des';
}

#oldui:checked ~ .ctrl:active
{
  transform: 
    translateY(20px);
}

@keyframes icono 
{
  0%{
    right: 100%;
  }
  70%{
    right: -20%;
  }
}

@keyframes sube 
{
  0%{
    transform: translateY(100%);
    opacity: 0;
  }
  100%{
    transform: translateY(0);
    opacity: 1;
  }
}
!

JS
!
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