.aleft { text-align: left; }
.acenter { text-align: center; }
.atop { vertical-align: top; }
.abottom { vertical-align: bottom; }
.inblock { display: inline-block; }
.fleft { float: left; }
.fright { float: right; }
.clear { clear: both; }
.pos-rel { position: relative; }
.pos-abs { position: absolute; }
.top0 { top: 0; }
.left0 { left: 0; }
.lmar { margin-left: 10px; }
.rmar { margin-right: 10px; }
.rmar-big { margin-right: 100px; }
.bmar { margin-bottom: 40px; }
.bmar0 { margin-bottom: 0 }

body,div {
    margin: 0;
}

#header, #content, #footer {
    min-width: 800px;
}

#header {
    position: fixed;
    background-color: white;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

#header-divider {
    display: block;
    margin: auto;
}

#content {
    margin-top: 93px;
    text-align: center;
    min-height: calc(100vh - 169px);
}

#footer {
    background-color: #111;
    color: white;
    font-size: small;
    text-align: center;
    font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande", "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
    padding: 16px;
    line-height: 18px;
}

#footer > span {
    margin: 0 10px;
    display: inline-block;
}

#nav-container {
    width: 70%;
    min-width: 850px;
    margin: auto;
}


#thera-outer {
    text-align:center;
    min-width: 850px;
    padding-left: 50px;
}

#thera-tleft, #thera-bleft {
    width: 50%;
    min-width: 440px;
    text-align: left;
}

#thera-tright, #thera-bright {
    width: 40%;
    min-width: 400px;
    text-align: left;
}

#bio-container {
    text-align: left;
    width: 84%;
    margin: auto;
}

#bio-image {
    float: left;
    margin-top: 30px;
    margin-right: 30px;
}

.nav-link-container {
    display: inline-block;
    width: 19%;
    margin: 0;
    text-align: center;
}

.nav-link-container > a {
    position: relative;
    width: 96px;
    height: 20px;
    display: inline-block;
}

.nav-link-container > a > img {
    position: absolute;
    top: 0;
    left: 0;
    transition: opacity 400ms;
}

.nav-link-container > a > .gray {
    opacity: 0;
}

.nav-link-container:hover > a > .black {
    opacity: 0;
}

.nav-link-container:hover > a > .gray {
    opacity: 1;
}

.nav-link-container > .blue,
.nav-link-container.current-page > a {
    display: none;
}

.nav-link-container.current-page > .blue {
    display: initial;
}