.upperpart
{
    padding: 30px 50px 40px 50px;
    background-color: snow;
    border-radius: 30px;
    color: lightcoral;
    text-align: center;
    margin-bottom: 50px;
}
body
{
    background-color: lightgray;   
}

.sub-name,.crhr,.grade
{
    outline: none;
    padding: 5px;
    text-align: center;
    margin-bottom: 2px;
    box-sizing: border-box;
}
.grade{
    cursor: pointer;
}

.semester {
    width: 90%;
    max-width: 550px;
    background-color: antiquewhite;
    border-radius: 5px;
    box-sizing: border-box;
    text-align: center;
    color: lightcoral;
}
.whole
{
   display: flex;
   flex-direction: column;
   align-items: center;
   width: 100%;
   box-sizing: border-box;
   justify-content: space-between; 
   gap: 20px;
}
.subadd,.semadd
{
    box-sizing: border-box;
    padding: 20px;
    background-color: rgb(23, 223, 23);
    color: white;
    text-align: center;
    font-size: 30px;
    border-radius: 10px;
    cursor: pointer;
}
.subremove,.semremove
{
    box-sizing: border-box;
    padding: 20px;
    background-color: red;
    color: white;
    text-align: center;
    font-size: 30px;
    border-radius: 10px;
    cursor: pointer;
}
.buttons,.sembuttons
{
    display: flex;
    flex-direction: row;   
    gap: 10px;                
    align-items: center;
    justify-content: center; /* added to center both sub and sem buttons horizontally */
}
.onecompsem
{
    padding: 10px;
    background-color: aliceblue;
    width: 90%;
    max-width: 550px;
    border-radius: 5px;
    box-sizing: border-box;
    text-align: center;
    display: flex;
    flex-direction: column; 
    align-items: center;
    justify-content: center;
    border-radius: 20px;
    margin-bottom: 50px;
}
@media (max-width: 400px) {
    .semester {
        width: 95%;
        padding: 15px;
    }

    .cgpa {
        width: 80%;
        padding: 20px;
    }

    .submission {
        width: 80%;
        padding: 15px;
    }

    .buttons {
        flex-direction: column;
        gap: 10px;
        align-items: center;
        justify-content: center;
    }

    .subadd, .subremove {
        padding: 15px 20px;
        font-size: 24px;
    }
}
.subadd:hover,.subremove:hover,.submission:hover
{
    transform: scale(1.10);
}
.allsems
{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
}
.sgpa
{
    color: lightcoral;
    margin-left: 10px;
}

.sembuttons {
    display: flex;
    justify-content: center; 
    gap: 20px;               
    margin: 20px 0;          
}
.submission
{
    padding: 30px 30px;
    background-color: rgb(2, 255, 2);
    color: wheat;
    width: 30%;
    border-radius: 10px;
    min-width: 100px;
    box-sizing: border-box;
    text-align: center;
    cursor: pointer;
  display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px auto;
    border: none;
}
.cgpa
{
    padding: 50px 50px;
    background-color: lightcyan;
    color: lightcoral;
    width: 30%;
    border-radius: 10px;
    min-width: 100px;
    box-sizing: border-box;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px auto;
}