*::-webkit-input-placeholder {
    color: #333;
    opacity: 1;
}

*:-moz-placeholder {
    color: #333;
    opacity: 1;
}

*::-moz-placeholder {
    color: #333;
    opacity: 1;
}

*:-ms-input-placeholder {
    color: #333;
    opacity: 1;
}

:root {
    --white: #fff;
    --gray: #666;
    --black: #000;
    --tr: transparent;
    --fs-10: 1.0rem;
    --fs-11: 1.1rem;
    --fs-12: 1.2rem;
    --fs-14: 1.4rem;
    --fs-16: 1.6rem;
    --fs-18: 1.8rem;
    --fs-20: 2rem;
}

body {
    background-image: url(../img/background.jpg);
    background-color: var(--black);
    background-repeat: no-repeat;
    background-position: center center;
    background-attachment: fixed;
    background-size: cover;
}