.center {
    position: fixed;
    width: calc(100% - 480px);
    display: flex;
    top: 0px;
    bottom: 0px;
    left: 240px;
    right: 240px;
    height: 100%;
    z-index: 1;
    box-sizing: border-box;
    flex-direction: column;
    align-items: center;
    /*padding: 10px;*/
    transition: all 0.2s ease;
}

.center-row {
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    margin-top: 5px;
    margin-bottom: 5px;
}

.center-stretch {
    height: 100%;
}

.center-block {
    width: 100%;
    max-width: 700px;
    min-width: min(100%, 300px);
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}

.column {
    position: fixed;
    display: flex;
    flex-direction: column;
    width: 240px;
    height: 100%;
    justify-content: flex-start;
    z-index: 10;
    box-sizing: border-box;
    /*padding: 10px;*/
    top: 0px;
    transition: all 0.2s ease;
}

.column-left {
    left: 0px;
}

.column-right {
    right: 0px;
}

@media (max-width: 1500px) {
.column {
    opacity: 0;
    visibility: hidden;
    transform: translateX(20px);
}

.center {
        width: 100%;
        left: 0;
        right: 0;
    }
}

@media (max-width: 768px) {
    .column {
        display: none;
    }
}