/* Step Sequencer Grid Cells */
.grid-cell-placeholder {
    position: absolute;
    width: 16px;
    height: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    transform: translate(-50%, -50%);
    /* Center on the coordinate */
    cursor: pointer;
    z-index: 5;
    transition: all 0.1s;
}

.grid-cell-placeholder:hover {
    border-color: rgba(255, 255, 255, 0.5);
    background-color: rgba(255, 255, 255, 0.1);
}

.grid-cell-placeholder.active {
    border-color: var(--accent-color);
    box-shadow: 0 0 5px var(--accent-color);
    background-color: rgba(255, 183, 77, 0.2);
    z-index: 6;
}

.grid-cell-placeholder.filled {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}