body{
    background-color: bisque;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
}

#calc-container{
    background-color: black;
    width: 420px;
    height: 500px;
    border-radius: 8px;
    text-align: center;
    margin-top: 20px;
    position: relative;
    box-shadow: 0 0 20px rgb(71, 71, 71);
}

h2{
    padding-left: 10px;
    text-align: left;
    letter-spacing: 1px;
    font-family: sans-serif;
    color: #fff;
}

h2::before{
    content: 'EX8201';
    display: block;
    font-size: 10px;
    color: aliceblue;
}

h2::after{
    content: 'v2';
    font-size: 14px;
    color: brown;
}

#primary-field{
    height: 1cm;
    border-radius: 0 0 4px 4px;
    margin-bottom: 10px;
    font-size: 0.8cm;
}

#secondary-field{
    height: .5cm;
    border-radius: 4px 4px 0 0;
    font-weight: bold;
}

#secondary-field, #primary-field{
    background-color: black;
    padding-right: 5px;
    text-align: right;
	outline: none;
	border: none;
    color: #fff;
    width: 94%;
    cursor: pointer;
}

#btnsRay{
    display: block;
    width: 100%;
    padding-top: 5px;
    padding-bottom: 15px;
    border-radius: 0 0 5px 5px;
}

#btnsRay1, #btnsRay2, #btnsRay3, #btnsRay4{
    width: 100%;
    padding-top: 10px;
    padding-right: 8px;
}

button{
    padding: 5px 10px;
    font-size: 22px;
    height: 1.2cm;
    width: 23.5%;
    border: none;
}

button:hover{
    background-color: rgb(238, 28, 28);
    color: #fff;
}

button:nth-child(4){
    background-color: orange;
}

button:nth-child(4):hover{
    background-color: rgb(73, 214, 148);
    color: rgb(187, 15, 15);
}

button:nth-child(5):hover{
    background-color: rgb(192, 104, 104);
    color: black;
}

button:nth-child(6):hover{
    background-color: gray;
    color: black;
}

#equals{
    position: relative;
    top: 10px;
    width: 72%;
    border-radius: 0 0 0 3px;
    border: none;
    background-color: rgb(192, 104, 104);
}

#del{
    position: relative;
    background-color: #b8b4be;
    top: 10px;
    border-radius: 0 0 3px 0;
}

footer{
    padding-top: 20px;
    letter-spacing: .1cm;
    color: #b8b4be;
}

h4{
    position: absolute;
    top: 480px;
    width: 95%;
    padding: 10px;
    font-size: 18px;
    font-family: sans-serif;
    letter-spacing: 1px;
    color: rgb(43, 42, 42);
    transition: 1s;
}