.flex-container {
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    flex-wrap: wrap;
    width: 100%;
    height: 85vh;
    overflow: hidden;
    position: absolute;
    float:left;
    left:0px; 

    -webkit-justify-content: flex-start;
    -ms-flex-pack: start;
    justify-content: flex-start;
    -webkit-align-content: flex-start;
    -ms-flex-line-pack: start;
    align-content: flex-start;
    -webkit-align-items: flex-start;
    -ms-flex-align: start;
    align-items: flex-start;
}

#order-list .flex-container::after {
    content: "";
    background: #434E5c;
    position: absolute;
    right: 0;
    width: 300px;
    height: 100%;
}

.flex-item {
    
    width: 100px;
    /*height: 100px;*/
    margin: 5px;
}