.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.4);
    -webkit-animation-name: fadeIn;
    -webkit-animation-duration: 0.4s;
    animation-name: fadeIn;
    animation-duration:0.4s;
}
.xd{
    position: relative;
    margin: 0 auto;
    width: 50%;
    height: 50%;
    border: 1px;
    border-block-color: #FFF;
    align-content: center;
    text-align: center;
    align-content: center;
}
.modal-content {
    border: 15px solid #ccc;
    border-top-color: #44c6ca;
    border-top-style: groove;
    height: 100px;
    width: 100px;
    border-radius: 100%;

    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    -webkit-animation: girar 1.5s linear infinite;
    -o-animation: girar 1.5s linear infinite;
    animation: girar 1.5s linear infinite;
}

@keyframes girar {
    from{ transform: rotate(0deg); }
    to{ transform: rotate(360deg); }
}