Style the icons by using Bootstrap classes (e.g. text-primary).
<i class="svg-icon svg-icon-stroke svg-icon-stroke-2 svg-icon-2xs text-primary mr-3">
<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128"><title>iStar_Design_Business_LineIcons_Live-18</title><rect x="50.68" y="93.89" width="26.64" height="10.1" transform="translate(128 197.88) rotate(180)"></rect><line x1="96.12" y1="110.3" x2="31.88" y2="110.3"></line><line x1="114.46" y1="117.82" x2="88.99" y2="117.82"></line><line x1="68.18" y1="117.82" x2="64.69" y2="117.82"></line><line x1="56.66" y1="117.82" x2="46.58" y2="117.82"></line><line x1="34.95" y1="117.82" x2="20.65" y2="117.82"></line><polyline points="84.25 109.94 84.25 87.94 43.74 87.94 43.74 109.94"></polyline><polygon points="64 22.23 68.74 31.83 79.33 33.37 71.66 40.84 73.47 51.38 64 46.4 54.53 51.38 56.34 40.84 48.67 33.37 59.26 31.83 64 22.23"></polygon><path d="M58.64,87.83V86.12A15.48,15.48,0,0,0,52.4,73.77c-9.68-7.28-19.63-19.22-19.63-38.34V10.18H94.13l-.08,25.25c0,16.29-9.54,31.33-19.39,38.55a15.45,15.45,0,0,0-6.4,12.46v1.39"></path><path d="M32.82,23.85l-14.54,0v.88c0,14.86,7.74,26.86,17.15,26.86"></path><path d="M38.1,57.9c-18,0-26.18-14.86-26.18-33.13v-4c0-1.71,1-3.1,2.18-3.1H32.68"></path><path d="M94.24,23.89h15.48v.88c0,14.86-7.82,26.86-18.38,26.86"></path><path d="M88.38,57.9c19.24,0,27.7-14.86,27.7-33.13v-4c0-1.71-1-3.1-2.18-3.1H94.38"></path><path d="M47.87,59.23A15.33,15.33,0,0,0,49.93,62"></path><path d="M40.63,35.6a50.72,50.72,0,0,0,3.64,16.92"></path></svg>
</i>
<i class="svg-icon svg-icon-stroke svg-icon-stroke-2 svg-icon-xs text-primary mr-3">
<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128"><title>iStar_Design_Business_LineIcons_Live-53</title><path d="M57.06,52a4.29,4.29,0,0,0-6.25,0"></path><path d="M76.08,52a4.29,4.29,0,0,0-6.25,0"></path><path d="M39.72,33.88a23.95,23.95,0,0,1,47.44,0"></path><path d="M35,32.73a28.42,28.42,0,1,1,56.84,0"></path><path d="M54.2,29.05c1.73,10.74,17.31,15.38,32,14.55"></path><path d="M54.2,29.05c0,8-5.79,12.78-13.47,14.55"></path><polyline points="62.07 70.64 35.06 66.78 34.75 59.06"></polyline><polyline points="63.73 94.75 73.99 106.31 87.78 91.29 81.86 81.15"></polyline><path d="M39.81,90.88,22.63,101.52a14.49,14.49,0,0,0-6.86,12.32v9.85"></path><path d="M87.59,90.88,105.37,102a14.5,14.5,0,0,1,6.86,12.32v9.36"></path><line x1="63.74" y1="116.41" x2="63.74" y2="123.69"></line><line x1="63.74" y1="109.1" x2="63.74" y2="110.61"></line><path d="M87.56,58l0,.2C86.21,68.18,80.65,78.5,71,82.47c-9.33,3.82-19.26-.23-25.16-8"></path><polyline points="63.73 94.75 53.48 106.31 39.69 91.29 45.61 81.15"></polyline><line x1="81.86" y1="81.15" x2="63.74" y2="94.76"></line><line x1="45.61" y1="81.15" x2="63.74" y2="94.76"></line><rect x="27.95" y="32.73" width="12.59" height="26.33" rx="5.79" ry="5.79"></rect><rect x="86.26" y="32.73" width="12.68" height="26.33" rx="5.83" ry="5.83"></rect><line x1="78.07" y1="77.85" x2="78.07" y2="83.91"></line><line x1="49.93" y1="78.77" x2="49.93" y2="84.39"></line></svg>
</i>
<i class="svg-icon svg-icon-stroke svg-icon-stroke-2 svg-icon-sm text-primary mr-3">
<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128"><title>iStar_Design_Business_LineIcons_Live-5</title><polyline points="53.91 89.78 53.91 101.86 33.54 98.67 33.54 75.77 49.43 78.25"></polyline><polyline points="20.28 57.17 68.86 64.75 68.86 118.37 20.28 110.78 20.28 68.39"></polyline><polyline points="100.18 68.24 100.18 110.78 68.86 118.37"></polyline><line x1="89.6" y1="106.85" x2="77.33" y2="109.82"></line><polyline points="93.55 105.89 95.25 105.48 95.25 101.55"></polyline><line x1="68.86" y1="64.75" x2="100.18" y2="57.17"></line><polyline points="51.1 49.28 62.28 41.6 110.86 49.19 99.69 56.87 110.96 65.01 79.64 72.59 68.86 64.75 54.38 72.98 5.8 65.39 20.28 57.17 8.61 50.28 39.93 42.69 51.1 49.13"></polyline><polygon points="111.5 29.83 80.19 24.94 122.2 9.63 111.5 29.83"></polygon><polyline points="20.28 57.12 51.6 49.53 100.18 57.17"></polyline><polyline points="38.44 89.13 42.67 94.77 57.2 78.45"></polyline><polyline points="103.12 28.52 96.21 34 96.21 27.44 122.2 9.63"></polyline><line x1="85.5" y1="33" x2="87.82" y2="31.42"></line><line x1="66.8" y1="45.82" x2="80.31" y2="36.56"></line><line x1="63.75" y1="55.87" x2="91" y2="37.2"></line><line x1="99.18" y1="40.06" x2="102.83" y2="37.56"></line><line x1="101.01" y1="99.89" x2="111.91" y2="99.89"></line><line x1="116.89" y1="99.89" x2="118.69" y2="99.89"></line><line x1="11.83" y1="99.89" x2="20.28" y2="99.89"></line></svg>
</i>
<i class="svg-icon svg-icon-stroke svg-icon-stroke-2 text-primary mr-3">
<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128"><title>iStar_Design_Business_LineIcons_Live-71</title><path d="M89.45,117.05V84.25a8.53,8.53,0,0,0-1.68-2.34"></path><line x1="111.48" y1="113.9" x2="111.48" y2="99.64"></line><path d="M66.43,117.05c0,2.1,5.15,3.79,11.51,3.79s11.51-1.69,11.51-3.79"></path><path d="M66.43,111.44c0,2.09,5.15,3.79,11.51,3.79s11.51-1.7,11.51-3.79"></path><path d="M66.43,105.82c0,2.1,5.15,3.79,11.51,3.79s11.51-1.69,11.51-3.79"></path><path d="M66.43,100.21c0,2.09,5.15,3.79,11.51,3.79s11.51-1.7,11.51-3.79"></path><path d="M66.43,94.59c0,2.09,5.15,3.79,11.51,3.79s11.51-1.7,11.51-3.79"></path><path d="M66.43,89c0,2.09,5.15,3.79,11.51,3.79S89.45,91.07,89.45,89"></path><path d="M70,76.8a13.15,13.15,0,0,0,5.13.85"></path><path d="M64.75,77.18c0,2.1,5.15,3.79,11.51,3.79s11.51-1.69,11.51-3.79-5.16-3.79-11.51-3.79S64.75,75.09,64.75,77.18Z"></path><line x1="66.43" y1="85.34" x2="66.43" y2="117.05"></line><path d="M90.5,91.3c0,2.1,5.16,3.79,11.51,3.79s11.52-1.69,11.52-3.79-5.16-3.79-11.52-3.79S90.5,89.21,90.5,91.3Z"></path><path d="M64.75,77.18v6.18c0,2.09,5.15,3.79,11.51,3.79s11.51-1.7,11.51-3.79V77.49"></path><path d="M90.5,91.3v6.18c0,2.09,5.16,3.79,11.51,3.79s11.52-1.7,11.52-3.79V91.3"></path><path d="M108.36,90.87a9,9,0,0,1-5.44,1"></path><path d="M111.48,108.28c0,2.09-5.16,3.79-11.51,3.79-4.69,0-8.72-.92-10.52-2.24"></path><path d="M111.48,113.9c0,2.09-5.16,3.79-11.51,3.79-4.69,0-8.72-.92-10.52-2.25"></path><path d="M111.48,102.54c0,2.09-5.16,3.79-11.51,3.79-4.69,0-8.72-.92-10.52-2.24"></path><line x1="104.45" y1="59.78" x2="101.04" y2="61.94"></line><line x1="100.59" y1="37.76" x2="97.97" y2="40.83"></line><path d="M65.53,85.34A22.25,22.25,0,1,1,69.28,73"></path><path d="M42.34,79.89a5.55,5.55,0,1,0,4.48-8.82h-.07a4.3,4.3,0,1,1,3.47-6.83"></path><line x1="46.75" y1="62.48" x2="46.75" y2="60.1"></line><line x1="46.75" y1="84.55" x2="46.75" y2="82.16"></line><path d="M29.83,11.45h0a36.65,36.65,0,0,1,34.41,0h0l-7,14.4H36.8Z"></path><path d="M81.8,73.86v-9A34.89,34.89,0,0,0,57.23,31.66H36.84A34.91,34.91,0,0,0,12.27,64.89V99.28A17,17,0,0,0,29.19,116.2H64.88c.52,0,1,0,1.54-.07"></path><line x1="36.82" y1="31.66" x2="36.82" y2="26.09"></line><line x1="57.26" y1="26.09" x2="57.26" y2="31.66"></line><line x1="50.42" y1="25.41" x2="53.29" y2="18.01"></line><line x1="43.63" y1="25.41" x2="40.76" y2="18.01"></line><line x1="58.46" y1="73.42" x2="59.83" y2="73.42"></line><line x1="36.27" y1="73.42" x2="37.65" y2="73.42"></line><polyline points="105.61 51.76 113.84 42.13 94.21 25.35 76.34 46.25"></polyline><path d="M102.76,47.48l2.07-2.43a3.06,3.06,0,0,1-.27-3.89l-7.94-6.8a3,3,0,0,1-3.89.34L78.86,50.93"></path><path d="M87.94,79.69,106.36,68a3.07,3.07,0,0,1,.89-3.8l-5.61-8.83a3.05,3.05,0,0,1-3.81-.81l-16,10.16"></path><polyline points="81.32 59.16 101.89 46.11 115.73 67.91 89.84 84.34"></polyline><polyline points="72.61 41.4 83.12 28.5 87.77 32.76"></polyline></svg>
</i>
<i class="svg-icon svg-icon-stroke svg-icon-stroke-2 svg-icon-lg text-primary mr-3">
<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128"><title>iStar_Design_Business_LineIcons_Live-85</title><polyline points="32.63 48.73 50.79 48.73 50.79 107.87 32.63 107.87"></polyline><rect x="11.81" y="42.7" width="20.48" height="71.2"></rect><path d="M104.18,93.4a6.69,6.69,0,0,1,6.66,6.67h0a6.69,6.69,0,0,1-6.66,6.67l-26.79.73c-17.14,0-26.55-3.44-26.55-3.44"></path><path d="M106.51,79.42a7,7,0,0,1,7,7h0c0,3.84-3.61,7-9.13,7"></path><path d="M108.89,65.48a7,7,0,0,1,7,7h0c0,3.84-3.2,7-9.21,7"></path><path d="M96,51.47H109.2a7,7,0,0,1,7,7h0a7,7,0,0,1-7,7"></path><path d="M51.21,54.08S77.3,55.2,77.3,14.94c0,0,16.26-8.45,11.11,28.1a7.39,7.39,0,0,0,7.3,8.43"></path><line x1="95.56" y1="59.11" x2="87.74" y2="59.11"></line><line x1="95.56" y1="72.53" x2="87.74" y2="72.53"></line><line x1="95.56" y1="85.95" x2="87.74" y2="85.95"></line><line x1="95.56" y1="99.37" x2="87.74" y2="99.37"></line><circle cx="20.83" cy="51.56" r="4.19"></circle><line x1="44.13" y1="91.82" x2="44.13" y2="101.79"></line><line x1="38.54" y1="91.82" x2="38.54" y2="101.79"></line><line x1="11.98" y1="79.33" x2="20.46" y2="70.85"></line><line x1="11.98" y1="90.51" x2="20.46" y2="82.03"></line></svg>
</i>
<i class="svg-icon svg-icon-stroke svg-icon-stroke-2 svg-icon-xl text-primary mr-3">
<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128"><title>iStar_Design_Business_LineIcons_Live-98</title><path d="M37.15,51.71a29.69,29.69,0,1,1,53.3.29"></path><polyline points="90.45 52 63.94 90.59 37.16 51.74"></polyline><path d="M64.73,15.66A22.41,22.41,0,0,1,87.14,38.07"></path><path d="M52.78,25.74a17.15,17.15,0,1,1-4,4.8"></path><line x1="63.12" y1="73.94" x2="70.35" y2="81.18"></line><line x1="58.64" y1="69.17" x2="55.07" y2="65.6"></line><path d="M75.51,73,68.12,65.6"></path><polyline points="48.82 80.66 48.82 111.96 18.3 118.92 18.3 62.78 32.88 59.45"></polyline><line x1="79.18" y1="118.92" x2="79.18" y2="96.43"></line><line x1="78.93" y1="87.81" x2="78.93" y2="81.02"></line><polyline points="92.98 59.63 109.7 55.82 109.7 111.96 79.18 118.92"></polyline><line x1="79.18" y1="118.92" x2="48.67" y2="111.96"></line><line x1="101.94" y1="65.6" x2="101.94" y2="92.08"></line><line x1="101.94" y1="101.03" x2="101.94" y2="113.72"></line><line x1="25.76" y1="69.17" x2="25.76" y2="81.02"></line><line x1="25.76" y1="89.19" x2="25.76" y2="117.22"></line></svg>
</i>
As alternative way you can always edit sizes by svg-code (without classes).