input[type="text"] {
    border: 1px solid gray;
    transition: all .5s;
}

input[type="text"]:focus {
  border-color: #66afe9;
  outline: 0;
  box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, 0.6);
}