body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    background: #f2f2f2;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.login-container {
    width: 300px;
    padding: 40px;
    background: #fff;
    text-align: center;
    box-shadow: 0 15px 25px rgba(0,0,0,.1);
    border-radius: 10px;
}

.login-form h2 {
    margin: 0 0 10px;
    padding: 0;
    color: #333;
    text-transform: uppercase;
}

.login-form h3 {
    margin: 0 0 30px;
    padding: 0;
    color: #555;
    font-weight: normal;
}

.input-group {
    position: relative;
    margin-bottom: 30px;
}

.input-group input {
    width: 100%;
    padding: 10px 0;
    font-size: 16px;
    color: #333;
    border: none;
    border-bottom: 1px solid #333;
    outline: none;
    background: transparent;
}

.input-group label {
    position: absolute;
    top: 0;
    left: 0;
    padding: 10px 0;
    font-size: 16px;
    color: #333;
    pointer-events: none;
    transition: .5s;
}

.input-group input:focus ~ label,
.input-group input:valid ~ label {
    top: -20px;
    left: 0;
    color: #007bff;
    font-size: 12px;
}

button {
    background: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 5px;
    text-transform: uppercase;
    font-size: 16px;
    transition: .5s;
}

button:hover {
    background: #0056b3;
}