header {
    text-align: center;
    border: 2px dotted #5b6080;
    width: 50vw;
    margin: auto;
    margin-top: 20px;
    margin-bottom: 20px;
    border-radius: 20px;
}
#lists-div {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
}
.list {
    margin: 15px;
    border: 1px dashed #ffb3d2;
    border-radius: 15px;
    padding: 30px;
}
#btw {
    margin: 15px;
    border: 4px solid #444864;
    border-radius: 15px;
    padding: 30px;
}
/* md */ 
@media (max-width: 768px) {
    #lists-div {
        grid-template-columns: repeat(1, 1fr);
    }
    .list {
        width: 80vw;
    }
}
@media (prefers-color-scheme: light) {
    header {
        border-color: #6b538f;
    }
    .list {
        border-color: #ca6d93;
    }
    #btw {
        border-color: #6b538f;
    }
}