* {
      box-sizing: border-box;
}

body {
    font-size: 100%;
    background-color: grey;
    font-variant-ligatures: no-common-ligatures;
    max-width: 2560px;
    margin: 0 auto;
}

#navigation {
    font-family: "Arial";
    font-size: 1em;
}
#navbar {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #262626;
    width: 100%;
}
li {
    float: left;
}
a {
    display: block;
    color: white;
    text-align: center; 
    padding: 14px 16px;
    text-decoration: none;
    border-right: 1px solid white;
}
a:link { color: white; }
a:active { color: black; }
a:visited { color: #6A5ACD; }

li a:hover {
    background-color: white;
}
#header {
    background-color: #0099cc;
    padding: 5px 17px 5px 17px;
    background-size: contain;
    background-image: url("hvacimg1.png"),url("hvacimg2.png");
    background-repeat: no-repeat;
    background-position: left bottom, right bottom;
    font-family: "Calibri";
    font-size: 1em;
}
h1 {
    text-align:center;
}
p {
    text-align:center;
    font-family: "Calibri";
    font-size: 1.5em;
}

#content {
    font-family: "Calibri";
    font-size: 1em;
    text-align: center;
    background-image: url("hvacHD2.jpg");
    height: 1440px;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    overflow: hidden;
}

#centercolumn {
    float: left;
    background-color: white;
    background-size: 60%, 60%;
    color: black;
    margin: 20px 17.5% 75px;
}

.bigcolumn {
    float: left;
    width: 50%;
    padding: 1px;
    background: white no-repeat fixed center;
    margin: 15px 2.5% 0 5%;
}
.smallcolumn {
    float: left;
    max-width: 25%;
    padding: 1px, 5px;
    background: white no-repeat fixed center;
    margin: 15px 7.5% 0 2.5%;
}

.white1 {
    background: white no-repeat fixed center;
}

.row:after {
    content: "";
    display: table;
    clear: both;
}
@media screen and (max-width:600px) {
    .bigcolumn {
        width: 100%;
    }
    .smallcolumn {
        width: 100%;
    }
}

img {
    width: 65%;
    height: auto;
    border: 1px solid black;
}

.active {
    background-color: #B0C4DE;
}

#services {
    border-collapse: collapse;
    border-spacing: 15px;
}
tr:nth-child(even) {
    background: #F5F5F5;
}