h1 {
  height: 70px;
  width: 100%;
  font-size: 18px;
  background: black;
  color: white;
  line-height: 150%;
  border-radius: 3px 3px 0 0;
  box-shadow: 0 2px 5px 1px rgba(0, 0, 0, 0.2);
  font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
h2 {
  height: 30px;
  width: 100%;
  font-size: 12px;
  background: red;
  color: white;
  line-height: 100%;
  border-radius: 3px 3px 0 0;
  box-shadow: 0 2px 5px 1px rgba(0, 0, 0, 0.2);
  font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  text-align:center;
}
h3 {
  font-size: 12px;
  color: black;
  font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  text-align:left;
  margin: 0px 25px 25px 25px;
}

form {
  box-sizing: border-box;
  width: 260px;
  margin: 100px auto 0;
  box-shadow: 2px 2px 5px 1px rgba(0, 0, 0, 0.2);
  padding-bottom: 40px;
  border-radius: 3px;
  background-color:white;
}
form h1 {
  box-sizing: border-box;
  padding: 20px;
}
form h2 {
  box-sizing: border-box;
  padding: 20px;
}

input {
  margin: 0px 25px 25px 25px;
  width: 200px;
  display:block;
  border: none;
  padding: 0 0 0 0;
  border-bottom: solid 1px #1abc9c;
  -webkit-transition: all 0.3s cubic-bezier(0.64, 0.09, 0.08, 1);
          transition: all 0.3s cubic-bezier(0.64, 0.09, 0.08, 1);
  background: -webkit-linear-gradient(top, rgba(255, 255, 255, 0) 96%, #000000 4%);
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 96%, #000000 4%);
  background-position: -200px 0;
  background-size: 200px 100%;
  background-repeat: no-repeat;
  color: #0e6252;
}
input:focus, input:valid {
  box-shadow: none;
  outline: none;
  background-position: 0 0;
}
input:focus::-webkit-input-placeholder, input:valid::-webkit-input-placeholder {
  color: #808080;
  font-size: 11px;
  -webkit-transform: translateY(-20px);
          transform: translateY(-20px);
  visibility: visible !important;
}

button {
  border: none;
  background: #000000;
  cursor: pointer;
  border-radius: 3px;
  padding: 6px;
  width: 200px;
  color: white;
  margin-left: 25px;
  box-shadow: 0 3px 6px 0 rgba(0, 0, 0, 0.2);
}
button:hover {
  -webkit-transform: translateY(-3px);
      -ms-transform: translateY(-3px);
          transform: translateY(-3px);
  box-shadow: 0 6px 6px 0 rgba(0, 0, 0, 0.2);
}
 
The magic happens in a few lines of code for the input:focus and input:valid. The CSS transform property plays a crucial role to achieve this little instant feedback effect.

input:focus::-webkit-input-placeholder, input:valid::-webkit-input-placeholder {
  color: black;
  font-size: 11px;
  -webkit-transform: translateY(-20px);
          transform: translateY(-20px);
  visibility: visible !important;
}

#logo-small-css
{
    width:50px;
    height:50px;
}