.sec {position: relative;}

.pic-list {
    width: 100%; max-width: 880px;
    margin: 0 auto !important;
    background: #f5f5f5; 
    justify-content: center !important;
    padding: 0 !important;
}

.pic-item {margin: 20px 0 10px 10px !important;}

.pic-item:nth-child(4n + 1) { margin-left: 0 !important;}

.ev_prepare {height: 300px;
    position: static;
    width: 800px;
    margin: 20px auto;
    border-radius: 10px;
}