* {
    box-sizing: border-box;
}
.support-warning {
    background: #ccb11c;
    color: #000;
    display: block;
    font-family: 'Raleway', sans-serif;
    font-weight: 700;
    opacity: 0.95;
    padding: 3rem;
    position: fixed;
    text-align: center;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 5;
}

.support-warning a {
    color: inherit;
}

.grid {
    display: flex;
    flex-wrap: wrap;
}

.grid--4x4 > .grid__item {
    flex: 1 0 auto;   
}


@supports(display: grid) {
    .support-warning {
         display: none;
    }
    
    .grid {
        display: grid;
    }
    
}

.grid--4x4 {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: repeat(auto-fit, minmax(50vh, auto) minmax(50vh, auto));
}

.align-center {
    align-items: center;
    justify-content: center;
}

.content {
    padding: 3.5rem;
    max-width: 400px;
}

.heading {
    font-family: 'Roboto', serif;
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.description {
    font-family: 'Roboto', sans-serif;
    font-size: 1rem;
    line-height: 1.5;
}

.theme-ukraine {
    background: #fffb1b;
    color: #26b2ea;
 }

 .theme-kb {
    background: #ff1b1b;
    color: #ffffff;
 }

 .theme-barbee {
    background: #fb1bff;
    color: #ffbfec;
 }

 .theme-france {
    background: #ffffff;
    color: #000000;
 }