.matrix {
    display: flex;
    flex-direction: column;
    margin: auto;
    width: max-content;
}
.cell {
    width: 20px;
    height: 20px;
    display: inline-block;
    text-align: center;
    vertical-align: middle;
    border: 1px solid #ccc;
}
.matrix-row {
    line-height: 10px;
    width: max-content;
}
.highlight-a {
    background-color: #ffeeba;
}
.highlight-b {
    background-color: #cce5ff;
}
.highlight-c {
    background-color: #d4edda;
}
.loop-tile {
    padding: 5px 10px;
    margin: 5px;
    background-color: #e9ecef;
    border: 1px solid #adb5bd;
    border-radius: 5px;
    cursor: pointer;
    position: relative;
}
.loop-box {
    min-height: 60px;
    border: 1px dashed #6c757d;
    padding: 10px;
}
.arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: #adb5bd;
    color: white;
    border: none;
    padding: 0 5px;
    cursor: pointer;
    z-index: 1;
}
.arrow-left {
    left: -20px;
}
.arrow-right {
    right: -20px;
}