styles.css

* {
    font-family: 'Montserrat','SF Pro Display', sans-serif;
}

html{
    background-color: #073b4c;
}

body {
    margin: 0;
}

.container {
    display: flex;
}

.left {
    display: flex;
    background: url(image.jpg), no-repeat;
    background-size: cover;
    width: 50%;
    height: 100vh;
    align-items: center;
    justify-content: center;
}

.right {
    background: #073b4c;
    width: 50%;
    height: 100vh;
    align-self: center;
    justify-items: center;
    color: white;
    overflow-y: scroll;
}

form {
    width: 100%;
    background: none;
}

.heading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: .5em 1em;
}

.heading p {
    margin: 0px;
    text-align: center;
    font-size: 3.5rem;
    color: #01161e;
    padding-top: 1.1em auto 0 auto;
}

.input {
    padding: 1.1em;
    align-items: center;
    text-align: center;
}

input {
    width: 90%;
    height: 2em;
    color: #FFFFFF;
    background-color: #001219;
    border: none;
    border-radius: 50px;
    padding: .5em .5em .5em 1.2em;
    font-size: 1.2rem;
}

input::placeholder {
    padding: 0;
    color: #FFFFFF;
}

.add {
    display: grid;
    padding: 1em;
    justify-content: center;
    align-items: center;
    box-shadow: none;
}

#add {
    align-self: center;
    display: block;
    width: 10em;
    height: 2.3em;
    padding: 0 1.1em;
    background-color: #01161e;
    color: #fff;
    border-style: solid;
    border-radius: 5em;
    font-size: 1.5rem;
    font-weight: 500;
    text-align: center;
}

#add:hover {
    cursor: pointer;
    color: #053444;
    font-weight: 500;
    background: none;
    backdrop-filter: blur(.2em);
    border-style: solid;
    transition: 0.25s;
}

.right p {
    text-align: center;
    font-size: 2rem;
}

.list {
    padding-left: 2em;
    text-align: left;
    font-size: 2rem;
}

.r-buttons {
    display: grid;
    text-align: center;
}

.del {
    width: 40%;
    height: 2.5em;
    color: #ef233c;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 5em;
    border-color: #ef233c;
    border-style: solid;
    background: none;
    margin: 0 0 1.5em 0;
}

.del:hover {
    background: #ef233c;
    color: #073b4c;
    transition: 0.25s;
}

@media (max-width: 700px) {
    .container{
        flex-direction: column;
    }
    .left{
        width: 100%;
        height: 50vh;
    }
    .right{
        width: 100%;
        height: 100%;
    }
    form{
        padding-top: 1em;
    }
    .heading p{
        font-size: 2.5rem;
    }
    #add{
        font-size: 1rem;
    }
    .list-container{
        font-size: 1rem;
    }
}