html,body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, textarea, p, blockquote, th, td {
    margin:0;padding:0;
}
.toast,style{
    display: none;
    position: fixed;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 7rem;
    height: 7rem;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0,0,0,0.2);
    border-radius: 0.5rem;
    color: #f0f0f0;
    font-size: 1rem;
}

.load {

    display: inline-block;
    margin-bottom: 1.5rem;
    height: 2rem;
    width: 2rem;
    border: 0.4rem solid transparent;
    border-top-color: white;
    border-left-color: white;
    border-bottom-color: white;
    animation: circle 1s infinite linear;
    -webkit-animation: circle 1s infinite linear; /* Safari 和 Chrome */
    border-radius: 50%
}

@-webkit-keyframes circle {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(-360deg)
    }
}