.rect{
   fill: blue;
   stroke: 10px red;
   transition: transform 3s;
}
.rect:hover{
    transform: rotate(360deg);
}



#btn{
    background-color: red;
    /* color: white; */
    width: 500px;
    display: block;
}

#dropdown-btn{
    background-color: yellow;
    display: none;
}

#btn:hover>#dropdown-btn{
    display:block;
    color: grey;
}


#alert-btn:hover .alertbox{
    display: block;
}

.alert-success{
    display: none;
}
#hide{
    display: none;
}

#progressbar{
    border-top: 1px solid yellow;
    transition: rotate(360deg);
}