.centre{
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%) 
}
.margin_custom {
	margin-top: 120px;
	margin-bottom: 10px;
	margin-right: -50px;
	margin-left: -50px;
}

.navbar-toggler {
    background-color: rgba(85,156,173,1);
}

.tooltip-inner {
    background: grey;
    font-size: 12px;
    font-weight: bold;
}

.bs-tooltip-auto[x-placement^=top] .arrow::before, .bs-tooltip-top .arrow::before {
    border-top-color:grey !important;
}