index.css

body {
    background-color: #CFDEE7;
    padding: 0;
    margin: 0;
}

.content {
    margin-left: 50px;
    display: block;
}

button {
    background-color: #5db5db;
    border: none;
    display: flex;
}

button:hover {
    background-color: #78C0E0;
    border-radius: 10px;
    
}

button:focus{
    background-color:#78C0E0;
    border-radius: 10px;
}

.selection-icon-algo {
    display: flex;
}

.selection-icons {
    font-size: 2em;
    padding-top: 0.3em;
    padding-bottom: 0.3em;
    border-radius: 10px 50px 0% 0%;
    display: flex;
    background-color: #5db5db;
    width: 510px;
    justify-content: center;
}

.selection-icons i {
    cursor:pointer;
    font-size: 2em;
    margin-left: 0.5em;
    margin-right: 0.5em;
    margin-bottom: 0.2em;
    margin-top: 0.2em;
}

.selection-algorithms {
    margin-left: 10em;
    padding-top: 0.3em;
    font-size: 2em;
    border-radius: 50px 50px 0% 0%;
    display: flex;
    background-color: #5db5db;
    width: 350px;
    justify-content: center;
}

.selection-algorithms select {
    font-size: 0.5em;
    margin-bottom: 0.2em;
    background-color: #5db5db;
    border: none;
    outline:none;
    text-align: center;
}

canvas {
    background-color: #78C0E0;
    /*border: 2px solid #5db5db;*/
    box-shadow: 3px 5px 5px gray;
}