.body{
    align-items: center;
}

.calendar_container{
    
    background-color: yellow;
    height: 500px;
    width: 800px;
    border: 5px solid;
    position:absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin-top: 180xp;
}

@media (max-width:900px){

    .calendar_container{
    
        background-color: yellow;
        height: 400px;
        width: 450px;
        border: 5px solid;
        position:absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        margin-top: 180xp;
    }

}