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body { background-color: #1a1a1a !important; color: white !important; }
button, .btn { 
    height: 100px !important; 
    width: 100% !important; 
    font-weight: bold !important; 
    border-radius: 15px !important;
}
#relay2_on { background-color: #2ecc71 !important; } /* VERT */
#relay3_on { background-color: #3498db !important; } /* BLEU */
#relay4_on { background-color: #ffffff !important; color: black !important; } /* BLANC */