:root {
    --font-primary: Arial, Helvetica, sans-serif;
    --shadow-dark: 0 1rem 3rem rgba(0, 0, 0, .5);
}

body {
    background-image: url(/img/bg-login.jpg);
    background-size: cover;
    background-repeat: no-repeat;
}

.container {
    padding: 50px;
    margin: 20px auto;
    width: 500px;
    background-color: white;
    border-radius: 10px;
}

.heading {
    font-family: var(--font-primary);
    font-size: 27px;
    text-align: center;
}

.form {
    display: flex;
    flex-direction: column;
    font-family: var(--font-primary);
    align-items: stretch;
    width: 100%;

    >* {
        margin: 2px;
    }
}

.label {
    margin-top: 10px;
}

.txt-field {
    height: 40px;
    width: 90%;
    padding-right: 20px;
    margin: 15px 0 15px 0;
    outline: none;
    border: none;
    border-bottom: 1px solid black;
}

.txt-field input {
    transition: all .2s;
}

.txt-field-username input:focus {
    border: none;
    outline: none;
    box-shadow: var(--shadow-dark);
    border-bottom: 3px solid black;
}

.txt-field-password input:focus {
    border: none;
    outline: none;
    box-shadow: var(--shadow-dark);
    border-bottom: 3px solid black;
}

.btn-login {
    margin-top: 50px;
    background: -webkit-linear-gradient(right, #00dbde, #fc00ff);
    height: 50px;
    width: 90%;
    border: none;
    outline: none;
    border-radius: 30px;
    color: white;
    font-size: 20px;
    font-weight: bold;
    transition: all .2s;
}

.btn-login:hover {
    transform: translateY(-5px);
    box-shadow: 0 1rem 2rem rgba(0,0,0, 0.2);
}