textarea{
    border: 3px solid rgba(128, 128, 128, 0.5);
    border-radius: 5px;
    background-color: rgba(128, 128, 128, 0.25);
    color: gray;
    font-size: xx-large;
    /*以下是过渡*/
    transition-delay: 0ms;
    transition-duration: 100ms;
    transition-property: all;
    transition-timing-function: linear;
}textarea:hover{
    border-width: 6px;
    border-style:inset;
    /*以下是阴影*/
    box-shadow: 3px 3px 6px black;
    text-shadow: 1px 1px 2px black;
}textarea:focus{
    border-width: 8px;
    border-style:outset;
    background-color: white;
    color: black;
    box-shadow: none;
    text-shadow: none;
}