Making all fonts Arial

how do i make all fonts Arial on my site?

body {
    background: #231404 url(../images/highlight.png) no-repeat left top;
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    color: #ffffff;
}
#page {
    width: 960px;
    margin: 0 auto;
    position: relative;
}
img {
    border: 0;
    font-size: 14px;
}
/*------------------------------ SPRITES ------------------------------*/
#navigation li:first-child a, #main ul li, #main ul li a, #headline div.body a.more {
	background: url(../images/buttons.png) no-repeat;
}
#contents, #headline {
	background: url(../images/bg-contents-bottom.png) no-repeat;
}
#contents > div, #adbox, #headline div.body {
	background: url(../images/bg-contents.png) repeat-y;
}
#footer .connect a {
	background: url(../images/icons.png) no-repeat;
}
/*------------------------------ HEADER ------------------------------*/
#header {
	min-height: 224px;
	position: relative;
}
/** Logo **/
#logo {
	display: block;
	width: 250px;
	padding-bottom: 30px;
}
/** Navigation **/
#navigation {
	background: url(../images/bg-menu.png) no-repeat;
	display: inline-block;
	height: 60px;
	width: 960px;
	list-style: none;
	margin: 0;
	padding: 1px 0 0;
	position: absolute;
	left: 0;
	top: 180px;
}
#navigation li {
	float: left;
	height: 55px;
	padding-left: 1px;
}
#navigation li a {
	color: #ffffff;
	display: block;
	font-size: 14px;
	height: 55px;
	line-height: 55px;
	padding: 0 32px;
	text-align: center;
	text-decoration: none;
	text-shadow: 0 -1px #44290c;
	text-transform: uppercase;
}
#navigation li a:hover, #navigation li.selected a {
	background-color: #5c400a;
}
#navigation li:first-child a {
	background-position: left top;
	display: block;
	height: 55px;
	width: 60px;
	padding: 0;
}
#navigation li:first-child a:hover, #navigation li:first-child.selected a {
	background-color: transparent;
	background-position: -66px top;
}
#navigation li.last-child a {
	padding-right: 36px;
}
#navigation li.last-child a:hover, #navigation li.last-child.selected a {
	background: #5c400a url(../images/bg-menu-selected-last.png) no-repeat right center;
}
/** Adbox **/
#adbox {
    background-position: left top;
    height: 496px;
    padding: 36px 1px 0;
    color: #ffffff;
}
#adbox div.details {
	background: url(../images/bg-headliner.png) repeat left top;
	color: #fff;
	font-family: "Times New Roman", Times, serif;
	height: 88px;
	width: 900px;
	padding-right: 58px;
	padding-top: 20px;
	text-align: right;
	position: absolute;
	bottom: 4px;
	left: 1px;
}
#adbox div.details h1 {
	font-weight: normal;
	font-size: 26px;
	line-height: 30px;
	margin: 0;
	text-transform: uppercase;
}
#adbox div.details p {
	margin: 0;
	font-size: 18px;
	line-height: 30px;
	letter-spacing: 1px;
}
/*------------------------------ CONTENTS ------------------------------*/
#contents {
	background-position: left bottom;
	margin-bottom: 30px;
	padding-bottom: 11px;
}
#contents > div {
	background-position: left bottom;
	padding-bottom: 1px;
}
#contents div.background {
    min-height: 830px;
    padding: 60px 20px 30px;
    font-size: 14px;
}
#contents h2 {
    color: #f0e99a;
    font-weight: normal;
    line-height: 30px;
    margin: 0;
    text-transform: uppercase;
}
#contents h4 {
    color: #louis
@charismacommunications.ca;
    font: 14px/30px Arial, Helvetica, sans-serif;
    letter-spacing: 1px;
    margin: 0;
    text-align: justify;
    text-transform: uppercase;
    color: #f0e99a;
}
#contents h4 a {
	color: #f0e99a;
	text-decoration: none;
}
#contents h4 a:hover {
	color: #a08a6b;
}
#contents p {
    color: #ffffff;
    font: 16px/30px "Times New Roman", Times, serif;
    letter-spacing: 1px;
    margin: 0;
    padding: 0 0 30px;
    text-align: justify;
    font-size: 20px;
}
#contents p a {
	color: #ffffff;
}
#contents p a:hover, #headline div.body p a:hover {
	color: #d1b676;
}
/** MAIN **/
#headline {
	background-position: -966px bottom;
	width: 958px;
	margin: 0 auto;
	padding-bottom: 12px;
}
#headline div.body {
	background-position: -966px bottom;
	padding: 20px 15px 0;
}
#headline div.body p {
    color: #ffffff;
    display: inline-block;
    font-family: "Times New Roman", Times, serif;
    font-size: 22px;
    letter-spacing: 1px;
    line-height: 36px;
    margin: 0;
    padding: 0 0 24px;
}
#headline div.body p a {
	color: #a08a6b;
}
#headline div.body a.more {
	background-position: -72px -65px;
	color: #cab18e;
	display: inline-block;
	font-size: 14px;
	line-height: 19px;
	height: 19px;
	width: 54px;
	padding-left: 8px;
	text-decoration: none;
}
#headline div.body a.more:hover {
	background-position: 0 -65px;
	color: #35240d;
}
/** Main **/
#main {
	color: #a08a6b;
	padding: 30px 15px;
}
#main h2 {
	margin-bottom: 20px;
	text-align: center;
}
#main p {
	font-family: "Times New Roman", Times, serif;
	line-height: 30px;
	padding-bottom: 18px;
}
#main p a {
	color: #ffffff;
}
#main ul {
	display: inline-block;
	list-style: none;
	margin: 0;
	padding: 0;
}
#main ul li {
	float: left;
	background-position: 0 -94px;
	height: 59px;
	width: 260px;
	padding-left: 40px;
}
#main ul li:first-child {
	padding-left: 20px;
}
#main ul li a {
	background-position: right bottom;
	color: #fff;
	display: block;
	line-height: 59px;
	height: 59px;
	width: 260px;
	padding-right: 38px;
	text-align: center;
	text-decoration: none;
	position: relative;
}
#main ul li a:hover {
	color: #d1b676;
}
/** Product and Contact Us **/
#list {
	color: #f0e99a;
	margin: 0;
	padding-left: 30px;
}
#list li {
	font-size: small;
	padding: 0 15px;
}
#list li p {
	padding-right: 0px;
}
#list li p em {
	color: #f0e99a;
	display: block;
	font: bold 14px/30px Arial, Helvetica, sans-serif;
}
#list li p em a {
	color: #f0e99a;
}
/** Services and Solutions **/
#solutions > div {
	width: 920px;
	margin: 0 auto;
	position: relative;
}
#solutions > div img, #services img {
	margin: 18px 0;
}
#solutions > div div {
	background: url(../images/bg-headliner.png) repeat left top;
	height: 82px;
	width: 862px;
	padding: 20px 58px 0 0;
	text-align: right;
	position: absolute;
	left: 0;
	bottom: 22px;
}
#solutions > div div h2 {
	color: #fff;
	display: inline-block;
	font-family: "Times New Roman", Times, serif;
	text-transform: uppercase;
}
#solutions > div div p {
	color: #fff;
	display: inline-block;
}
/** News **/
#news ul {
	list-style: none;
	margin: 30px 0 0;
	padding: 0;
}
#news ul li {
	background: url(../images/border.png) repeat-x left top;
	display: inline-block;
	width: 920px;
	margin-bottom: 30px;
	padding: 60px 0 0;
}
#news ul li:first-child {
	background: none;
	padding-top: 0;
}
#news ul li img {
	float: right;
	margin-left: 20px;
	margin-top: 6px;
}
#news ul li:first-child img {
	float: left;
	margin-left: 0;
	margin-right: 20px;
}
#news li p em {
	color: #f0e99a;
	display: block;
	font: bold 14px/30px Arial, Helvetica, sans-serif;
	letter-spacing: normal;
}
#news li p em a {
	color: #f0e99a;
}
/** Blogs **/
#blogs {
    display: inline-block;
    color: #ffffff;
}
#blogs div:first-child {
	float: left;
	width: 896px;
	margin-right: 30px;
}
#blogs div.sidebar {
	float: right;
	height: 100%;
	width: 184px;
}
#blogs div.sidebar ul {
	color: #ffffff;
	font-size: small;
	margin: 0 0 30px;
	padding-left: 15px;
}
#blogs div.sidebar ul li a {
	color: #ffffff;
	font: 16px/30px "Times New Roman", Times, serif;
	text-decoration: none;
}
#blogs div.sidebar ul li a:hover {
	text-decoration: underline;
}
/** Contacts **/
#contacts {
	list-style: none;
	margin: 0;
	padding: 0;
}
#contacts li p em {
	display: block;
	font-style: normal;
	text-transform: uppercase;
}
/*------------------------------ FOOTER ------------------------------*/
#footer {
	color: #ffffff;
	font-size: 12px;
	width: 940px;
	padding: 30px 10px;
}
#footer .connect {
	float: left;
	display: inline-block;
	line-height: 26px;
	margin-right: 30px;
}
#footer .connect span {
	float: left;
	margin-right: 5px;
}
#footer .connect a {
	float: left;
	display: block;
	height: 26px;
	margin: 0 6px;
}
#footer .connect a.facebook {
	background-position: -48px 0;
	width: 12px;
}
#footer .connect a.twitter {
	background-position: -48px -36px;
	width: 38px;
}
#footer .connect a.googleplus {
	background-position: -48px -72px;
	width: 25px;
}
#footer .connect a.facebook:hover {
	background-position: 0 0;
}
#footer .connect a.twitter:hover {
	background-position: 0 -36px;
}
#footer .connect a.googleplus:hover {
	background-position: 0 -72px;
}
#footer p {
	line-height: 26px;
	margin: 0;
	text-align: right;
}


.gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    padding: 20px;   231404
    background-color: #44290c;
    border: 1px solid #ddd;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.thumbnail {
    width: 150px;
    height: 150px;
    overflow: hidden;
    border: 1px solid #ddd;
    box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.thumbnail img:hover {
    transform: scale(1.1);
    color: #5c400a;
}

You can use the * selector to target all the elements at once.

sorry. what is a selector?

@louis5

A selector is the name of the html element in css, such as: tags, class, id and more
example:

//syntax example:

selector {
        property: value;
}

//from your code:

#logo {
	display: block;
	width: 250px;
	padding-bottom: 30px;
}

so #logo is your id selector that has several properties (display, width, padding-bottom) and their respective values(block, 250px, 30px)

the * selector selects all of your elements in your page and gives them a universal property that all of these elements will share, for example with the Arial font:

*    {
font-family: Arial;
}

Now all your elements have Arial as their font.
It is important to note that the * selector can be overridden if you give the same property as you have in the * selector to a more specific selector

thank you everyone for the help.

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