* {
    --gap: 1.5rem;
}

body {
    margin: 0;
    padding: 0;
    background-image: url("/images/background_main.png");
    background-size: cover;
    background-attachment: fixed;
    background-position: top center;
    background-repeat: no-repeat;
}
div.background:before {
    content: "";
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: url("/images/background_main.png") center top no-repeat;
    background-size: 100% auto;
    z-index: -1;
}

main {
    max-width: 450px;
    min-width: 300px;
    margin: auto;
    overflow-x: scroll;
}

p {
    margin: 0;
}

button {
    cursor: pointer;
}
button:hover {
    position: relative;
    opacity: 0.8;
    top: 1px;
}
button:active {
    position: relative;
    opacity: 0.3;
    top: 2px;
}
button:disabled,
button[disabled] {
    position: unset !important;
    border: 1px solid #999999 !important;
    background: #cccccc !important;
    color: #666666 !important;
    opacity: 0.3 !important;
}

img {
    max-width: 100%;
}