html {
    font-size: 14px;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

html, body {
    min-height: 100vh;
    min-width: 100vw;
    margin: 0;
    padding: 0;
    border: 0;
    font-family: Arial, serif;
    color: black;
    justify-content: space-between;
}

:root {
    --header-bg-color: #3ecbcb;
    --footer-bg-color: #797979;
    --control-btn-color: transparent;
    --control-btn-brightness-hover: 80%;
    --control-btn-border-color-select: black;
}

header {
    min-width: 100%;
    background-color: var(--header-bg-color);
}

footer {
    min-width: 100%;
    background-color: var(--footer-bg-color);
}

h1 {
    text-align: center;
}

main {
    flex-grow: 1;
    width: 100%;
}

.container {
    display: flex;
    flex-flow: column wrap;
    justify-content: center;
    align-content: center;
    align-items: center;
    gap: 10px 25px;
    width: 100%;
}

.hor {
    flex-flow: row wrap !important;
    gap: 0;
}

.gap10 {
    gap: 10px !important;
}

.groups {
    background-color: var(--footer-bg-color);
}

.group {
    width: 100%;
    display: flex;
    justify-content: center;
}

.groups a {
    width: 100%;
    text-decoration: none;
    color: black;
}

.group:hover {
    backdrop-filter: brightness(var(--control-btn-brightness-hover));
}


.item:hover {
    backdrop-filter: brightness(var(--control-btn-brightness-hover));
}

a {
    text-decoration: none;
    color: black;
}

.warning {
    color: red;
}

.wide {
    width: 100%;
}

img {
    max-width: 200px;
    max-height: 200px;
}