*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    font-size: 18px;
    outline: none;
}

input, textarea, select {
    -webkit-appearance: none;
    background-color: #FF0509;
}

body{
    background-color: #aaaaaa;
}

.header_calk{
    width: 100%;
    height: 175px;
    background-color: #FF0509;
    border-radius: 20px 20px 0 0;
}

.calculator{
    position: absolute;
    width: 400px;
    height: 580px;
    top: 50%;
    left: 50%;
    margin-top: -290px;
    margin-left: -200px;
    background-color: #ffffff;
    border-radius: 20px;
    box-shadow: 0 5px 5px 5px rgba(0,0,0, 0.3);
}

.button{
    display: inline-block;
    width: 72px;
    height: 72px;
    margin: 4px;
    font-size: 36px;
    background-color: #e7e7e7;
    cursor: pointer;
    border: 0;
    border-radius: 1000px;
    transition: .1s;
}

.buttons{
    position: relative;
    left: 8%;
    top: 40px;
}

.button:hover{
    background-color: #FF0509;
    color: #ffffff;
}

.button:active{
    background-color: #e7e7e7;
}

.button_c{
    position: absolute;
    top: -100px;
}

.input{
    border: none;
    background-color: #FF0509;

}

.text_input{
    position: relative;
    left: 50%;
    color: #e7e7e7;
    margin-left: -40%;
    top: 70px;
    font-size: 48px;
    width: 80%;
    height: 40px;
    margin-bottom: 20px;
    text-align: right;
    border: none;
}