.alertContainer {
    z-index:999999;
    position: fixed;
    bottom: 20px;
    right: 20px;
    max-width: calc(100% - 40px);
    width: auto;
}

.alertContainer > .alert {
    -webkit-box-shadow: 3px 3px 10px -1px rgba(0,0,0,0.2);
    -moz-box-shadow: 3px 3px 10px -1px rgba(0,0,0,0.2);
    box-shadow: 3px 3px 10px -1px rgba(0,0,0,0.2);
}