body {
 background-color: #cccccc;
}

.formulario  .titulo { 
  color: #757575;
  font-size: 1.5em;
  margin-bottom: 10px;
  padding-bottom: 10px;
}
.formulario {
  max-width: 500px;
  margin: auto;
  background: white;
  overflow: hidden;
  padding: 20px;
}
:focus{outline: none;}
.label { 
  float: left; 
  width: 100%; 
  margin-bottom: 25px; 
  position: relative;
}
.input-bordas{
  
  font: 15px/24px "Lato", Arial, sans-serif; 
  color: #333; 
  width: 100%; 
  box-sizing: border-box; 
  letter-spacing: 1px;
  border: 1px solid #ccc; 
  padding: 7px 14px 9px; 
  transition: 0.4s;
}
.textarea { resize:none!important; }
.input-bordas ~ .focus-border:before,
.input-bordas ~ .focus-border:after{content: ""; position: absolute; top: 0; right: 0; width: 0; height: 2px; background-color: #3399FF; transition: 0.2s; transition-delay: 0.2s;}
.input-bordas ~ .focus-border:after{top: auto; bottom: 0; right: auto; left: 0; transition-delay: 0.6s;}
.input-bordas ~ .focus-border i:before,
.input-bordas ~ .focus-border i:after{content: ""; position: absolute; top: 0; left: 0; width: 2px; height: 0; background-color: #3399FF; transition: 0.2s;}
.input-bordas ~ .focus-border i:after{left: auto; right: 0; top: auto; bottom: 0; transition-delay: 0.4s;}
.input-bordas:focus ~ .focus-border:before,
.input-bordas:focus ~ .focus-border:after{width: 100%; transition: 0.2s; transition-delay: 0.6s;}
.input-bordas:focus ~ .focus-border:after{transition-delay: 0.2s;}
.input-bordas:focus ~ .focus-border i:before,
.input-bordas:focus ~ .focus-border i:after{height: 100%; transition: 0.2s;}
.input-bordas:focus ~ .focus-border i:after{transition-delay: 0.4s;}
.button-form { 
  background-color: #39f;
  padding: 0.5em 1.3em;
  color: #fff;
  font-size: 1.2em;
  border: none;
  cursor: pointer;
}
.borda-inversa {
  display: inline-block;
  vertical-align: middle;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  box-shadow: 0 0 1px rgba(0, 0, 0, 0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -moz-osx-font-smoothing: grayscale;
  -webkit-transition-duration: 0.5s;
  transition-duration: 0.5s;
  -webkit-transition-property: background;
  transition-property: background;
  box-shadow: inset 0 0 0 2px #39f, 0 0 1px rgba(0, 0, 0, 0);
}
.borda-inversa:hover, .borda-inversa:focus, .borda-inversa:active {
  
  background: none;
  color:#39f; 
}