HyperCube/Pages/ModalLoading.razor

<div class="modal @modalClass" tabindex="-1" role="dialog" style="display:@modalDisplay; overflow-y: auto;">
    <div class="modal-dialog modal-sm" role="document">
        <div class="modal-content">
            <div class="modal-body">
                <div style="text-align: center;">
                    <div class="lds-roller"><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div></div>
                </div>
                <p style="text-align:center; margin-top:20px">Пожалуйста, подождите...</p>
            </div>
        </div>
    </div>
</div>

@if (showBackdrop)
{
    <div class="modal-backdrop fade show"></div>
}

<style>
    .lds-roller {
        display: inline-block;
        position: relative;
        width: 80px;
        height: 80px;
    }

        .lds-roller div {
            animation: lds-roller 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
            transform-origin: 40px 40px;
        }

            .lds-roller div:after {
                content: " ";
                display: block;
                position: absolute;
                width: 7px;
                height: 7px;
                border-radius: 50%;
                background: #000000;
                margin: -4px 0 0 -4px;
            }

            .lds-roller div:nth-child(1) {
                animation-delay: -0.036s;
            }

                .lds-roller div:nth-child(1):after {
                    top: 63px;
                    left: 63px;
                }

            .lds-roller div:nth-child(2) {
                animation-delay: -0.072s;
            }

                .lds-roller div:nth-child(2):after {
                    top: 68px;
                    left: 56px;
                }

            .lds-roller div:nth-child(3) {
                animation-delay: -0.108s;
            }

                .lds-roller div:nth-child(3):after {
                    top: 71px;
                    left: 48px;
                }

            .lds-roller div:nth-child(4) {
                animation-delay: -0.144s;
            }

                .lds-roller div:nth-child(4):after {
                    top: 72px;
                    left: 40px;
                }

            .lds-roller div:nth-child(5) {
                animation-delay: -0.18s;
            }

                .lds-roller div:nth-child(5):after {
                    top: 71px;
                    left: 32px;
                }

            .lds-roller div:nth-child(6) {
                animation-delay: -0.216s;
            }

                .lds-roller div:nth-child(6):after {
                    top: 68px;
                    left: 24px;
                }

            .lds-roller div:nth-child(7) {
                animation-delay: -0.252s;
            }

                .lds-roller div:nth-child(7):after {
                    top: 63px;
                    left: 17px;
                }

            .lds-roller div:nth-child(8) {
                animation-delay: -0.288s;
            }

                .lds-roller div:nth-child(8):after {
                    top: 56px;
                    left: 12px;
                }

    @@keyframes lds-roller {
        0% {
            transform: rotate(0deg);
        }

        100% {
            transform: rotate(360deg);
        }
    }
</style>

@code {
    [Parameter]
    public RenderFragment Body { get; set; }

    private string modalDisplay = "none;";
    private string modalClass = "";
    private bool showBackdrop = false;

    public void Open()
    {
        modalDisplay = "block;";
        modalClass = "show";
        showBackdrop = true;
    }

    public void Close()
    {
        modalDisplay = "none";
        modalClass = "";
        showBackdrop = false;
    }
}