.content {
    max-width: 768px;
    margin-left: auto;
    margin-right: auto;
    padding-top: 1em;
    padding-left: 1em;
    padding-right: 1em;
    background: #eee;
}
.more-space {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}
.hint {
    color: #666;
    font-size: 0.9em;
}
.error {
    color: #c00;
    font-weight: bold;
}
.attributes {
    width: 100%;
}
.disabled-label {
    color: #999;
    cursor: not-allowed;
}
h1 {
    letter-spacing: 0;
    text-align: center;
    width: 100%;
}
pre {
    background: #fff;
    padding: 0.5em;
}
.overlay {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.7);
    z-index: 1000;
}
.loader {
    display: inline-block;
    width: 48px;
    height: 48px;
    margin: 0.5em auto;
    border: 5px solid #ccc;
    border-top-color: #1f8dd6;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}