window { margin: 0px; background-color: #0f0f17; border-radius: 10px; opacity: 0.8; } #inner-box { background-color: #1a1b26; margin: 5px; border: none; border-radius: 10px; } #outer-box { background-color: #0f0f17; margin: 5px; border: none; border-radius: 10px; }