body {
    min-width: 720px;
    background-color: #eee;
}

.app {
    display: flex;
    flex-direction: column;
}


.btn {
    text-decoration: none;
    color: #fff(34, 153, 70);
    padding: 10px 15px 10px 15px;
    background-color: #72ac51;
    border-radius: 10px;

}


.btn:hover {
    background-color: #2f6f4f;
}

.main {
    padding: 10px;
    padding-top: 120px;
    padding-bottom: 20px;
    background: #eee;
}

.main .content {
    padding: 30px;
    margin: auto;
    margin-top: -75px;
    margin-bottom: 25px;

    height: 90%;
    width: 80%;  
    min-height: 700px;
    background-color: #fff;
    text-align: center;
    border-radius: 20px;
}