div.addBus {
    margin-left: 50px;
}

#topBus {
    background-color: antiquewhite;
    height: 100px;
}

.busPreview, .connectorPreview, .inputPreview{
    display: flex;
    justify-content: center;
    align-items: center;
}
.connectorPreview {
    margin-top:20px;
}

.inputPreview{
    padding-top:65px;
}
.busColors {
    display: flex;
    justify-content: center;
    align-items: center;
}

.busColors .color {
    margin: 10px;
}

.bus,  .connector, .input {
    position: relative;
    top: 0;
}