index.css

html {
    min-height: 100%;
    display: flex;
}
.header {
    margin-bottom: 20px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}
.first-title {
    font-size: 48px;
    font-weight: bolder;
}
.language-menu {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    font-size: 24px;
}
.language-item {
    cursor: pointer;
}
body {
    margin: 0;
    background: url(/img/zip/index-bg.jpg);
    background-size: cover;
    background-position: center;
}
.background-image {
    object-fit: cover;
    width: 100%;
    height: 100%;
    position: fixed;
    z-index: -1;
    object-position: center;
}
.main-containt {
    padding: 50px;
    color: white;
}
.main-menu {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    align-content: center;
    width: 100%;
}
.main-menu-item {
    width: 300px;
    height: 100px;
    color: white;
    text-decoration: none;
    background-color: rgba(240, 88, 86, 0.9);
    text-align: center;
    line-height: 100px;
    font-size: 24px;
    margin-right: 10px;
    margin-bottom: 10px;
    transition: background-color 0.2s, transform 0.2s;
}
.main-menu-item:hover {
    background-color: rgba(240, 88, 86, 1);
    cursor: pointer;
    transform: scale(1.2, 1.2);
}
.footer {
    position: absolute;
    bottom: 10px;
    left: 50%;
    margin-left: -75px;
    color: white;
}
@media screen and (max-width: 1100px) {
    .main-menu-item {
        width: 48%;
        min-width: 300px;
        height: 300px;
        font-size: 50px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-items: center;
        justify-content: center;
    }
    .language-menu {
        font-size: 38px;
    }
    .footer {
    display: none;
   }
}
@media screen and (max-width: 700px) {
    .main-menu-item {
        width: 80%;
        min-width: 300px;
    }
    .footer {
        display: none;
    }
}