body {
    margin: 0px;
    padding: 0px;
    font-family: sans-serif;
    /*background: #34495e;*/
    background: #03A9F4;
}
.box {
    width: 300px;
    padding: 40px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #191919;
    text-align: center;
    border: 3px solid #3498db;
}
.box h1 {
    color: white;
    text-transform: uppercase;
    font-weight: 500;
}
.box input[type="text"], .box input[type="password"] {
    border: 0;
    background: none;
    display: block;
    margin: 20px auto;
    text-align: center;
    border: 3px solid #3498db;
    padding: 14px 10px;
    width: 200px;
    outline: none;
    color: white;
    border-radius: 25px;
    transition: 0.25s;  /*this transition is for form*/
}
.box input[type="text"]:focus, .box input[type="password"]:focus {
    width: 280px;
    border-color: #2ecc71;
}
.box input[type="submit"] {
    border: 0;
    background: none;
    display: block;
    margin: 20px auto;
    text-align: center;
    border: 3px solid #3498db;
    padding: 14px 10px;
    width: 100px;
    outline: none;
    color: white;
    border-radius: 25px;
    transition: 0.25s;  /*this transition is for form*/
    cursor: pointer;
}
.box input[type="submit"]:hover {
    background-color: #2ecc71;
}