@keyframes typing { 
    from { width: 0; } 
}

@keyframes blink-caret { 
    50% { 
        border-color: transparent; 
    } 
}

.cssPrint {
    width: 100%;
    height: 100%;
    background-color: black;
    &_h1 {
        display: inline-block;
        color: lime;
        font: bold 200% Consolas;
        /*font: bold 200% "Source Code Pro";*/
        /*必须使用等宽字体*/
        border-right: .1em solid currentColor;
        width: 28ch; 
        margin: 2em 1em;
        white-space: nowrap;
        overflow: hidden;
        animation: typing 3s steps(20, end),
                blink-caret .5s step-end infinite alternate;   
                /*step-end每个关键帧在end处跳转，infinite无限循环播放，alternate来回播放，normal顺序播放*/
    }
}