.success-signup{
    background-color:#D8F3E5;
    position: absolute;
    top: 0;
    left:50%;
    padding: 50px 10px;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
    transform: translateX(-50%);
    width: 30%;
    box-shadow: 0 4px 15px #c6c6c6;
    animation: slidedownAlert 1000ms linear forwards;
}

@keyframes slidedownAlert {
    0%{
        top:-1000px
    }
    100%{
        top:0;
    }
}

@media screen and (max-width:768px) {
    .success-signup{
        width: 50%;
    } 
}

@media screen and (max-width:450px) {
    .success-signup{
        width: 80%;
    } 
}