/**
$('<div>').prop({ class: "spinner" }).appendTo($('#contenedor'));
$('.spinner').remove();
**/

.spinner {
    border: 1px solid;
    position: fixed;
    z-index: 1;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' viewBox='0 0 50 50'%3E%3Cpath d='M28.43 6.378C18.27 4.586 8.58 11.37 6.788 21.533c-1.791 10.161 4.994 19.851 15.155 21.643l.707-4.006C14.7 37.768 9.392 30.189 10.794 22.24c1.401-7.95 8.981-13.258 16.93-11.856l.707-4.006z'%3E%3CanimateTransform attributeType='xml' attributeName='transform' type='rotate' from='0 25 25' to='360 25 25' dur='0.6s' repeatCount='indefinite'/%3E%3C/path%3E%3C/svg%3E") center / 50px no-repeat;
}

button{
    margin-top: 5px;
}

input{
    margin-top: 5px;
}