footer {
        text-align: center;
        font-family: sans-serif;
        width: 100%;
        bottom: 0;
        position:fixed;
	color: #fff;
    }


#text1 {
 border-bottom: solid;
	border-bottom-color:blueviolet;
	text-align: center;
	background-color: beige;
}

.options_p {
	margin-top: 2em;
	margin-left: 1em;	
}

.select_option {
text-align: center;
}

.js_button {
	margin-left: 1em;
	margin-right: 1em;
}

#input_multiply {
	width: 2em;
	height: 2em;
}

#p_particle {
	width: 1920px;
	height: 100%;
	display: none;
}
#text_p > * {
	margin: 3px;

}