body{
    width: 90%;
    max-width: 1280px;
    margin: auto;
  	overflow-wrap: break-word;
}

summary {
    cursor: pointer;
    transition: 0.3s;
}

.illusts summary:hover {
    cursor: pointer;
    background-color: #BBC8E6; /*淡藤色*/
}
        
.illusts summary {
    display: block;
}  
        
.illusts summary::-webkit-details-marker {
    display: none;
}