styles.css

@import url(https://fonts.googleapis.com/css?family=Raleway:400&subset=latin,latin-ext);
* {
    box-sizing: border-box;
    margin: 0;
}
body {
    font-family: 'Raleway';
    background-color: var(--c1);
}
:root {
    --c1: #BCD4DE;
    --c2: #A5CCD1;
    --c3: #A0B9BF;
    --c4: #9DACB2;
    --c5: #949BA0;
}

/* Base CSS */
.main-box {
    border: 1px solid black;
    border-radius: 15px;
    width: 40%;
    margin: 5vh auto;
    padding: 2%;
    text-align: center;
    background-color: var(--c5);
}
.main-box h2 {
    font-size: 30px;
    font-weight: bold;
    margin: 2%;
}
.main-box p {
    margin: 2%;
}
.main-box button {
    background-color: var(--c2);
    border: 1px solid white;
    border-radius: 7px;
    padding: 1.25% 4%;
    font-size: 20px;
    transition: 0.3s;
}
.main-box button:hover,
.main-box button:focus {
    cursor: pointer;
    background-color: var(--c1);
}

/* Counter CSS */
#counter-num {
    font-size: 30px;
}

/* List CSS */
#text-input {
    border: 1px solid white;
    border-radius: 7px;
    padding: 1.25% 4%;
    font-size: 20px;
}
#list-area {
    width: 50%;
    margin: 2vh auto;
    font-size: 20px;
}