ghost/core/core/frontend/src/cards/css/button.css

.kg-button-card,
.kg-button-card * {
    box-sizing: border-box;
}

.kg-button-card {
    display: flex;
    position: static;
    align-items: center;
    width: 100%;
    justify-content: center;
}

.kg-button-card.kg-align-left {
    justify-content: flex-start;
}

.kg-button-card a.kg-btn {
    display: flex;
    position: static;
    align-items: center;
    padding: 0 1.2em;
    height: 2.4em;
    line-height: 1em;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    font-size: 0.95em;
    font-weight: 600;
    text-decoration: none;
    border-radius: 5px;
    transition: opacity 0.2s ease-in-out;
}

.kg-button-card a.kg-btn:hover {
    opacity: 0.85;
}

.kg-button-card a.kg-btn-accent {
    background-color: var(--ghost-accent-color);
    color: #fff;
}