impress.js custom style css

style.css

body {
    font-family: sans-serif;
    line-height: 1.5;
    font-size: 48px;

    background: #333333;
    background: -webkit-radial-gradient(center bottom, circle farthest-corner, #666666, #333333, black);
    background: -moz-radial-gradient(center bottom, circle farthest-corner, #666666, #333333, black);
    background: -o-radial-gradient(center bottom, circle farthest-corner, #666666, #333333, black);
    background: -ms-radial-gradient(center bottom, circle farthest-corner, #666666, #333333, black);
    background: radial-gradient(center bottom, circle farthest-corner, #666666, #333333, black);

    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.step {
    width: 900px;

    -webkit-box-sizing: border-box;
    -moz-box-sizing:    border-box;
    -ms-box-sizing:     border-box;
    -o-box-sizing:      border-box;
    box-sizing:         border-box;

    -webkit-transition: opacity 1s;
    -moz-transition:    opacity 1s;
    -ms-transition:     opacity 1s;
    -o-transition:      opacity 1s;
    transition:         opacity 1s;

    text-shadow: rgba(0,0,0,.01) 0 0 1px; /* Chrome @font-face anti-aliasing fix */
}

.step:not(.active) {
    opacity: 0;
}

.slide {
    display: block;
    width: 900px;
    height: 700px;
    color: #eee;
    text-shadow: 0 2px 2px rgba(0, 0, 0, .9);
    font-size: 30px;
    line-height: 36px;
    letter-spacing: -1px;
    position: relative;

    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    border-radius: 10px;
}

.title {
    color: #eee;
    font-size: 60px;
    padding: 20px;
    line-height: 65px;
    text-align: center;
    position: absolute;
    letter-spacing: normal;
    top: 25%;
}

.slide-title {
    color: #fff;
    height: 120px;
    font-size: 36px;
    line-height: 120px;
}

.slide-content {
    font-size: 30px;
    text-align: justify;
    padding: 15px 40px;
    line-height: 40px;
}