.container {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
}

header {
    grid-column: span 12;
    background-color: blue;
}


footer {
    grid-column: span 12;
    background-color: violet;
    width: 100%;
}

/*изображения визиток*/
.card-images {
    grid-column: span 8;
    text-align: center;
    padding-top: 50px;
}

/*калькулятор*/
.calc {
    grid-column: span 4;
    margin-top: 50px;
    border: 7px solid #1267ae;
    border-radius: 10px;
    background-color: #a6e1ec;
    padding: 20px 40px;
}

/*Bootstrap analog styles*/

.form-control {
    display: block;
    width: 100%;
    height: 34px;
    padding: 6px 12px;
    font-size: 14px;
    line-height: 1.42857143;
    color: #555;
    background-color: #fff;
    background-image: none;
    border: 1px solid #ccc;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075);
    -webkit-transition: border-color ease-in-out .15s, -webkit-box-shadow ease-in-out .15s;
    -o-transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
    transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s
}

#final_price {
    font-size: 40px;
    font-weight: 900;
}

.hide-image {
    display: none;
}

.show-slow {
    display: inline-block;
    opacity: 0;

    animation: fadeIn 2s;
    animation-delay: 0.1s;
    animation-fill-mode: forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/*добавляем адаптивность*/
@media screen and (max-width: 768px) {
    .calc {
        grid-column: span 6;
    }

    .card-images {
        grid-column: span 6;
    }
}

@media screen and (max-width: 480px) {
    .calc {
        grid-column: span 12;
    }

    .card-images {
        grid-column: span 12;
    }
}