body{
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

h1, h3, p{  text-align: center;
    padding: 0;
    margin:5px 0 ;

}
h1{
    margin-top: 20px;
    margin-bottom: 20px;
}
p{
    margin-bottom: 20px;
}

form{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

#grade1{
    width: 300px;
    height: 30px;
    margin-bottom: 5px;
    border-radius: 10px;
    border: 1px solid black;
}
#addrowbtn{
    margin-top: 30px;
    width: 300px;
    height: 30px;
    border-radius: 10px;
    border: 1px solid black;
    background-color: #77dc77;
    color: white;
        transition: all 0.3s ease-in-out;
}
#resetbtn{
    width: 300px;
    margin-top: 1px;
    height: 30px;
    border-radius: 10px;
    border: 1px solid black;
        transition: all 0.3s ease-in-out;
}

#calculatebtn{
    width: 300px;
    margin-top: 10px;
    height: 30px;
    border-radius: 10px;
    border: 1px solid black;
    background-color: #43caff;
    color: white;
        transition: all 0.3s ease-in-out;
}

#calculatebtn:hover, #addrowbtn:hover, #resetbtn:hover{
    cursor: pointer;

}

#calculatebtn:hover{
    transition: all 0.3s ease-in-out;
    background-color: #6f929f;
    box-shadow: none;
}
#addrowbtn:hover{
    transition: all 0.3s ease-in-out;
    background-color: #649d51;
    box-shadow: none;
}
#resetbtn:hover{
    transition: all 0.3s ease-in-out;
    background-color: #a7a5a5;
    color: white;
    box-shadow: none;
}

.calculator-form{
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin: 10px;
    padding: 30px;
    background-color: aliceblue;
    width: 350px;
    border-radius: 20px;
    border: 1px solid black;
}