main.css

@font-face {
	font-family: "Shrikhand";
	src: url('Shrikhand-Regular.ttf');
}

body{
    color: white;
    background-color: rgb(27, 27, 27);
}

.screen{
    display: block;
    margin-top: 5%;
    margin: auto;
    margin-bottom: 1%;
    width: 90%;
    height: 50px;
    background-color: rgb(0, 0, 0);
    border: none;
    color: white;
    text-align: right;
}

.button button{
    display: inline-block;
    width: 24%;
    height: 100%;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    outline: none;
    color: #fff;
    background-color: rgb(22, 22, 22);
    border: none;
    border-radius: 15px;
    box-shadow: 0 6px rgb(5, 5, 5);
}

.button-option button{
    display: inline-block;
    width: 24%;
    height: 100%;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    outline: none;
    color: #fff;
    background-color: rgb(22, 22, 22);
    border: none;
    border-radius: 15px;
    box-shadow: 0 6px rgb(5, 5, 5);
}

.button button:hover{
    background-color: rgb(15, 15, 15)
}

.button-option button:hover{
    background-color: rgb(15, 15, 15)
}

.button button:active{
    background-color: rgb(8, 8, 8);
    box-shadow: 0 5px rgb(0, 0, 0);
    transform: translateY(4px);
}

.button-option button:active{
    background-color: rgb(8, 8, 8);
    box-shadow: 0 5px rgb(0, 0, 0);
    transform: translateY(4px);
}

.button {
    display: block;
    margin: auto;
    margin-top: 15px;
    width: 90%;
    height: 80px;
}

.button-option{
    display: block;
    margin: auto;
    margin-top: 10px;
    width: 90%;
    height: 20px;
}

.line-1{
    margin-top: 5px;
}