style.css

*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body{
    height: 100%;
    background-color: lightgray;
}

h1{
    font-size: 3rem;
    font-weight: 50;
    margin: 1rem 0 3rem;
    text-align: center;
    color: black;
    font-family: 'Open Sans', sans-serif;
}

.input_div{
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.input_div .input{
    padding: 0.5rem 1rem;
    height: 50px;
    outline: none;
    border: none;
    background-color: #fff;
    width: 450px;
    font-size: 1.15rem;
    margin: 0.25rem;
    border-radius: 25px;
}

.addButton{
    height: 50px;
    width: 50px;
    border-radius: 25px;
    outline: none;
    border: none;
    background-color: #fff;
    color: mediumblue;
    margin: 0.25px;
    cursor: pointer;
    transition: 0.3s;
}

.addButton:hover{
    background-color: mediumblue;
    color: #fff;
    
}

.container{
    
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin-top: 2rem;
}

.item{
    background-color: darkgray;
    padding: 0.5px;
    transition: 0.3s;
}

.item:hover{
    background-color: white;
    padding: 0.5px;
}

.item_input{
    background: none;
    outline: none;
    color: black;
    border: none;
    width: 350px;
    font-size: 1.4rem;
    margin: 1rem;
}

.editButton{
    height: 50px;
    width: 50px;
    border-radius: 25px;
    outline: none;
    border: none;
    color: black;
    margin: 5px;
    cursor: pointer;
    transition: 0.3s;
    background: transparent;
}

.editButton:hover{
    background-color: mediumseagreen;
    color: #fff;
    
}

.removeButton{
    height: 50px;
    width: 50px;
    border-radius: 25px;
    outline: none;
    border: none;
    color: black;
    margin: 5px;
    cursor: pointer;
    transition: 0.3s;
    background: transparent;
}

.removeButton:hover{
    background-color: lightcoral;
    color: #fff;
    
}