app.css

/* Eric Meyer's Reset CSS v2.0 - http://cssreset.com */
html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video{border:0;font-size:100%;font:inherit;vertical-align:baseline;margin:0;padding:0}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:none}table{border-collapse:collapse;border-spacing:0}

body {
    background: #f2f1ef;
    color: #3d3c37;
    font-family: 'Crete Round', 'Georgia', 'Times New Roman';
    font-size: 16px;
}
h1 {
    font-size: 26px;
    text-align: center;
    margin-bottom: 15px;
}
p {
    line-height: 1.5em;
    margin: 10px 0;
    padding: 0 5px;
}
em {
    font-weight: normal;
    color: #4BA9A9;
}
#container {
    width: 560px;
    margin: 0 auto;
    margin-top: 30px;
    padding: 20px;
    background: #fbfbfb;
    border-radius: 3px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.25);
}
#other {
    width: 560px;
    margin: 20px auto;
    padding: 20px;
}
#text-to-read {
    width: 538px;
    height: 300px;
    padding: 10px;
    border-radius: 3px;
    border: 1px solid #3d3c37;
    background: #fff;
    font-family: 'Consolas', monospace;
    font-size: 14px;
    color: #3d3c37;
    line-height: 1.5em;
    resize: vertical;
}

#reading-screen {
    display: none;
    width: 560px;
    height: 322px;
    position: relative;
}
#word {
    width: 100%;
    height: 300px;
    text-align: center;
    font-size: 72px;
    word-break: break-all;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    height: 30%;
}
#options {
    margin: 10px 0;
}
.row {
    height: 30px;
}
#wpm {
    float: left;
}
#reading-speed {
    width: 70px;
    margin: 0;
    margin-left: 10px;
    margin-top: -3px;
}
#text-info {
    float: right;
}
input[type="checkbox"] {
    position: relative;
    top: 1px;
}
#text-progress {
    width: 100%;
    position: absolute;
    bottom: 0;
}
#new {
    display: none;
}
.btn {
    width: 100px;
    padding: 7px 20px;
    margin-right: 20px;
    border: 1px solid #265757;
    border-radius: 3px;
    background: -webkit-linear-gradient(#5EB8B8, #4BA9A9);
    background: -moz-linear-gradient(#5EB8B8, #4BA9A9);
    background: -o-linear-gradient(#5EB8B8, #4BA9A9);
    background: linear-gradient(#5EB8B8, #4BA9A9);
    box-shadow: 0 1px 0 #265757, inset 0 0px 2px #fff, 0 0 7px rgba(0, 0, 0, 0.25);
    color: #fff;
    text-shadow: 1px 1px 0px rgba(0,0,0,0.5);
    cursor: pointer;
    font-family: 'Crete Round', 'Georgia', 'Times New Roman';
}
.btn:hover {
    background: -webkit-linear-gradient(#75c2c2, #4BA9A9);
    background: -moz-linear-gradient(#75c2c2, #4BA9A9);
    background: -o-linear-gradient(#75c2c2, #4BA9A9);
    background: linear-gradient(#75c2c2, #4BA9A9);
}
.btn:active {
    background: -webkit-linear-gradient(#4BA9A9, #5EB8B8);
    background: -moz-linear-gradient(#4BA9A9, #5EB8B8);
    background: -o-linear-gradient(#4BA9A9, #5EB8B8);
    background: linear-gradient(#4BA9A9, #5EB8B8);
}
li {
    margin-left: 30px;
    list-style-type: circle;
    line-height: 1.5em;
}

/* Night mode */
body.night {
    background-color: #111;
    color: #ddd;
}
.night #container {
    background-color: #000;
}
.night #text-to-read {
    background: #111;
    color: #ddd;
}
.night #word {
    color: #fff;
}
.night #reading-speed {
    background-color: #222;
    color: #ddd;
    border-width: 1px;
}


/* Responsive styles */

@media (max-width: 650px) {
    #container {
        width: auto;
        margin-top: 0;
        border-radius: 0;
    }
    #text-to-read, #reading-screen {
        box-sizing: border-box;
        -moz-box-sizing: border-box;
        width: 100%;
    }
    #other {
        width: auto;
        margin: 0;
    }
    #word {
        font-size: 50px;
    }
}