body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
}

.btn {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

/* Стили самого Popover */
.popover {
    position: absolute; /* Важно для позиционирования */
    z-index: 1000;
    display: block;
    max-width: 276px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-style: normal;
    font-weight: 400;
    line-height: 1.5;
    text-align: left;
    text-decoration: none;
    text-shadow: none;
    text-transform: none;
    letter-spacing: normal;
    word-break: normal;
    word-spacing: normal;
    white-space: normal;
    line-break: auto;
    font-size: 0.875rem;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 0.3rem;
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.2);
}

.popover-header {
    padding: 0.5rem 0.75rem;
    margin-bottom: 0;
    font-size: 1rem;
    background-color: #f7f7f7;
    border-bottom: 1px solid #ebebeb;
    border-top-left-radius: calc(0.3rem - 1px);
    border-top-right-radius: calc(0.3rem - 1px);
}

.popover-body {
    padding: 0.5rem 0.75rem;
    color: #212529;
}

/* Стрелочка снизу (опционально, для красоты) */
.popover::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 10px 10px 0;
    border-style: solid;
    border-color: #fff transparent transparent transparent;
}
.popover::before {
    content: "";
    position: absolute;
    bottom: -11px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 11px 11px 0;
    border-style: solid;
    border-color: rgba(0, 0, 0, 0.2) transparent transparent transparent;
}